为什么我的apache配置失败？求各位朋友指导

我有两个域名，A,B

我的是Windows主机

做了如下配置：





Listen 80
<VirtualHost 121.199.13.55:80>
ServerName "A.com"
ServerAlias  A.com
DocumentRoot "D:\Site\A"
<Directory "D:\Site\A">
    Options Indexes FollowSymLinks
    AllowOverride None
    Order allow,deny
    Allow from all
</Directory>
</VirtualHost>


<VirtualHost 121.199.13.55:80>
ServerName "B.com"
ServerAlias B.com
DocumentRoot "D:\B"
<Directory "D:\B">
    Options Indexes FollowSymLinks
    AllowOverride None
    Order allow,deny
    Allow from all
</Directory>
</VirtualHost>




为什么打开B的网址却跳转到A网址啊，打开A网址是正常的？我上网查了相关资料，感觉我的配置没问题，求指教，很急