On his way home he suddenly remembered that he (not lock) ______ the door of the office.

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问题 On his way home he suddenly remembered that he (not lock) ______ the door of the office.

选项

答案had not locked

解析 根据句意,从句的动作发生在主句的动作之前,而主句用了一般过去时,所以从句要使用过去完成时。
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