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The clients( ) the lawyer for half an hour because he is sti

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The clients( ) the lawyer for half an hour because he is still having a meeting. A.have waited
B.have been waiting for C.has waited D.are waiting for
理由也说一下
The clients( ) the lawyer for half an hour because he is sti
B 首先wait是不及物动词 所以是wait for 排除AC 后面说he is still having a meeting表示客人已经等了半个小时 但是可能还将持续等下去 所以用现在完成进行时
再问: D有什么错
再答: 这句话里有for + 一段时间 一般是跟完成时的