【題目】As he approached the door, Mike looked into the room again to see if he _______ anything behind.

A. left B. had left

C. has left D. would leave

【答案】B

【解析】B 考察動詞時態(tài)。句意：當他快到門口的時候，麥克再一次看看房間是否落下什么東西。Leave behind所表示的動作發(fā)生在look into之前，因此使用過去完成時，表示在過去的某一時間或者某一動作之前就發(fā)生的動作。故B正確。

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