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--- You didn’t lock the back door. --- You are wrong. I .A.have locked itB.lock

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--- You didn’t lock the back door. --- You are wrong. I .A.have locked itB.lock

--- You didn’t lock the back door.

--- You are wrong. I ______.

A.have locked it

B.lock it myself

C.did lock it

D.do lock it

试题答案

C

did +动词原形表示对过去动作的强调。 “你没锁后门”“你错了,我确实锁了” 选C