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

解析本题为动词时态题，测试的是过去完成进行时用法。该句的主句为过去时，从句中的谓语动词表示的动作发生在主句谓语之前，并已持续一段时间。因此本题答案为C。

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