C# 求这个通过Newtonsoft.Json解析json

{
 "isSuccess": true,
 "errorMsg": "",
 "timeStamp": "14",
 "nonce": "13090713",
 "sign": "3B732684B206EB3CE324E1E0FD4FAD368A638BD4",
 "data": {
 "msg": "",
 "inkey": [
 {
 "paper_uid": "4bc8ebf2-7b1a-4952-a437-827810eaf78b",
 "paper_name": "sater试卷",
 "question_num": 6,
 "total_score": "35",
 "begin_time": "2015-03-02 16:31:16",
 "allow_exam_time": "0",
 "exam_grade_uid": "BD1972C5-6614-41E2-A270-D9C9DB1D509B",
 "wait_time": 5,
 "allow_showAnswer": "N",
 "show_preQuestion": "Y",
 "exam_do_mode_code": "46209b31-3154-4f1a-88e0-c286ba3fcdc9"
 },
 [
 {
 "paper_node_name": "单选题",
 "question_num": "2",
 "question_score": "0",
 "total_score": "5"
 },
 [
 {
 "question_uid": "f86fa985-7295-4f4f-892f-d0e910b36459",
 "question_base_typec_code": "single",
 "paper_question_score": "5",
 "question_text": "选什么？A",
 "standard_answer": "A",
 "question_exam_time": 20
 },
 [
 {
 "select_answer_value": "A",
 "select_answer_text": "1111"
 },
 {
 "select_answer_value": "B",
 "select_answer_text": "222"
 },
 {
 "select_answer_value": "C",
 "select_answer_text": "333"
 },
 {
 "select_answer_value": "D",
 "select_answer_text": "4444"
 }
 ]
 ],
 [
 {
 "question_uid": "a7c04502-32db-4918-b037-4b42a0034720",
 "question_base_typec_code": "single",
 "paper_question_score": "0",
 "question_text": "单选题___选B",
 "standard_answer": "B",
 "question_exam_time": 20
 },
 [
 {
 "select_answer_value": "A",
 "select_answer_text": "qqqqqq"
 },
 {
 "select_answer_value": "B",
 "select_answer_text": "wwwww"
 },
 {
 "select_answer_value": "C",
 "select_answer_text": "eeeee"
 },
 {
 "select_answer_value": "D",
 "select_answer_text": "rrrrrrrr"
 }
 ]
 ]
 ],
 [
 {
 "paper_node_name": "多选题",
 "question_num": "1",
 "question_score": "0",
 "total_score": "8"
 },
 [
 {
 "question_uid": "6465e790-02db-41d5-a387-06156196c8f1",
 "question_base_typec_code": "multi",
 "paper_question_score": "8",
 "question_text": "选什么？AB",
 "standard_answer": "A|B",
 "question_exam_time": 20
 },
 [
 {
 "select_answer_value": "A",
 "select_answer_text": "aaaa"
 },
 {
 "select_answer_value": "B",
 "select_answer_text": "bbb"
 },
 {
 "select_answer_value": "C",
 "select_answer_text": "cccc"
 },
 {
 "select_answer_value": "D",
 "select_answer_text": "dddd"
 }
 ]
 ]
 ],
 [
 {
 "paper_node_name": "判断题",
 "question_num": "1",
 "question_score": "0",
 "total_score": "12"
 },
 [
 {
 "question_uid": "48f09eaa-9a44-4960-8610-7ec138865943",
 "question_base_typec_code": "judge",
 "paper_question_score": "12",
 "question_text": "判断---对的，",
 "standard_answer": "Y",
 "question_exam_time": 20
 },
 [
 {
 "select_answer_value": "N",
 "select_answer_text": "错误"
 },
 {
 "select_answer_value": "Y",
 "select_answer_text": "正确"
 }
 ]
 ]
 ],
 [
 {
 "paper_node_name": "填空题",
 "question_num": "1",
 "question_score": "0",
 "total_score": "5"
 },
 [
 {
 "question_uid": "72a40be5-b93a-46a0-a3e2-d3a82e4d6d7f",
 "question_base_typec_code": "fill",
 "paper_question_score": "5",
 "question_text": "填空___ok",
 "standard_answer": "ok",
 "question_exam_time": 20
 },
 []
 ]
 ],
 [
 {
 "paper_node_name": "问答题",
 "question_num": "1",
 "question_score": "0",
 "total_score": "5"
 },
 [
 {
 "question_uid": "4d20a8a6-81ae-426f-bdfe-83c9d79848c1",
 "question_base_typec_code": "answer",
 "paper_question_score": "5",
 "question_text": "问答题？嗯",
 "standard_answer": "嗯",
 "question_exam_time": 20
 },
 []
 ]
 ]
 ]
 }
 }