After Jackson (wait) ______ for an hour, he reached the conclusion that Mr. Smit

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问题 After Jackson (wait) ______ for an hour, he reached the conclusion that Mr. Smith was not coming.

选项

答案 had been waiting

解析本题中wait所表动作从过去某一时刻开始，一直持续到过去另一时刻，强调的是动作的持续时间长。因此用过去完成进行时比较恰当。

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