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I______ waiting for two months by the time I received the reply.A、must beB、had
I______ waiting for two months by the time I received the reply.A、must beB、had
游客
2023-11-16
33
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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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