Question

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

Answer 1

答案A
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。