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

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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. [br]

选项

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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