问题
He was about to leave the office for home _______someone knocked the door and asked for some help
A:until
B:while
C:as
D:when
B:while
C:as
D:when
正确答案是：
同类题型
Tom, did you go to Sally’s party yesterday evening—-No, because I _________.
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I advise you leave the company as soon as possible you get yourself into trouble.[ ]
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