They returned my keys to me. Someone (pick) ______ them up in the street.

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问题 They returned my keys to me. Someone (pick) ______ them up in the street.

选项

答案had picked

解析 他们把钥匙还给了我。有人在街上拾到了。pick动作发生在动词return之前,所以用过去完成时。
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