I go to bed when I heard someone knocking at the door．A.was about toB.had just t
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I ________ go to bed when I heard someone knocking at the door．
A.was about to
B.had just to
C.would
D.would like to
试题答案
A
解析：be about to…when…是一个常用句型，意为“正准备……这时……”。when作“这时”讲时，起并列连词的作用，连接两个并列分句。