问题 选择题

I was about to go to bed _____ someone knocked at the door.

A.when

B.then

C.at the time

D.and

答案

答案:A

考查固定搭配。be about to do sth. when sb. did sth.意为“正要做某事时,这时,有人......”。句意“我正要去睡觉时,这时有人敲门。”故选A。

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