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

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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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