英语三级B级
填空题After Jackson (wait) ________ for an hour, he reached the conclusion that Mr. Smith was not coming.
参考答案：暂无进入在线模考
本题答案：had been waiting。句意：在等待了一个小时以后，Jackson确信smith先生不会来了。本题中wait这个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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