After I ______ for half an hour, I realized that he was not coming.A、have waited

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问题 After I ______ for half an hour, I realized that he was not coming.

选项 A、have waited
B、waited
C、had been waiting
D、was waiting

答案 C

解析该句的主句是一般过去时 (realized) ，从句的谓语动词 (wait) 表示的动作发生在主句谓语 (realize) 之前，构成了过去的过去，也就是过去完成时，而且已经持续了一段时间，所以应该用过去完成进行时，表示动作 (wait) 发生在过去的过去，并一直持续到了过去某一时间。

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