Sam looked everywhere but still couldn’t find his dictionary. ______ Sam looked everywhere, he still couldn’t find his dictionar

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问题 Sam looked everywhere but still couldn’t find his dictionary.
______ Sam looked everywhere, he still couldn’t find his dictionary.

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答案Had looked

解析 英语中,当两个动作发生时,发生在前的动作往往用过去完成时,寻找字典发生在前,因此填had looked。
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