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You can,t get in.The exam___for over 30 minutes. A.has been

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You can,t get in.The exam___for over 30 minutes. A.has been on B.has began C.began ...
You can,t get in.The exam___for over 30 minutes.
A.has been on B.has began C.began D.begins
选择哪个?为什么,能能详细讲解一下下呵,谢谢各位亲~急呵,今晚就要!
为什么不选B呢?
You can,t get in.The exam___for over 30 minutes. A.has been
因为begin是短暂性动作,而测试已经开始了30分钟,是持续性动作.所以用has began 这一表达方式就不对