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Hardly ___________ the papers on his desk when the door burs

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Hardly ___________ the papers on his desk when the door burst open.
A.he collected B.he had collected C.did he collect D.had he collected
选出答案并请说明原因,
那为什么要用过去完成时呢?
Hardly ___________ the papers on his desk when the door burs
D 这个题目要注意两点:
首先hardly放在句首要部分倒装
第二,要注意时态问题,要用过去完成时,表示这个动作先发生.
如果用正常的语序应该是:
He had hardly collected the papers on his desk when the door burst open.
他刚整理好桌上的文件门就突然开了.