I______ waiting for two months by the time I received the reply.A、must beB、had

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问题 I______ waiting for two months by the time I received the reply.

选项 A、must be
B、had been
C、could be
D、must have been

答案 B

解析动词时态题。根据题意，have been waiting for two months这件事是从过去的时间开始，一直到我收到回复。如果某一动作：(始于)过去一(延续到)另一个过去的时间，则用过去完成时，因此选择B。

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