When Clinton opened his bag on the train, he found that he (forget) ______ to put the clean shirts in.

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问题 When Clinton opened his bag on the train, he found that he (forget) ______ to put the clean shirts in.

选项

答案had forgotten

解析 宾语从句,从句的动作发生在主句的动作之前,用过去完成时。
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