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成人学位英语考试高频词汇be about to do...when
be about to do...when 就要做某事时，突然……
【例句】I was about to wash my face when he came back.
当他回来的时候我正要去洗脸
【总结】be about to do...when 时态问题及如何解题when在这里的用法很特别，它是并列连词=and then
——这一点很重要!
记住一下规律：
...was/were about to do...when sth. did...
=...was//were on the point of doing...when sth. did...
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