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I ________ my key to my office at home, so I had to wait until other teachers ________ to open the door.

[  ]
A.

had left; came

B.

left; came

C.

has left; came

D.

left; would come

答案:A
解析:

本题考查过去完成时和一般过去时的比较。leave my key这个动作明显发生在had to wait之前,所以为过去的过去,用过去完成时;而come这个动作是出现在until引起的时间状语从句中,应该用一般过去时代替过去将来时,所以答案为A项。


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