He ______ (不应该让我们等了那么长时间) for no reason at all, which is quite impolite. shouldn

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问题 He ______ (不应该让我们等了那么长时间) for no reason at all, which is quite impolite.

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答案 shouldn’t have kept us waiting for such a long time

解析本题考查情态动词should和keep后面用分词做宾语补足语的用法。shouldn’t+have done表示过去不应该做的事却做了，意为“本不应该做”；keep sb./sth. doing sth. 表示持续做某事。

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