________ you didn’ t have a key, I wouldn’ t have locked the door.

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问题 ________ you didn’ t have a key, I wouldn’ t have locked the door.

选项 A、If I know
B、If I knew
C、Had I known
D、Were I to know

答案C

解析 这是表示同过去事实相反的虚拟语气,Had I known=If I had known。句意:我要是知道你没钥匙,就不会锁门了。
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