六代cpu能装win7吗:英语问题.

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1.Last Sunday my mother_______ in her office.
A.was to work B. was at work

2.The little boy didn't come until we were ready to leave(用哪个词可以换)
A.before B.after C.when D.while

3.He was the second,only metres___the winner.
A.behind B.after C.beside D.to

我要超详细的答案请各位大虾帮忙了

1. B

be at work 在工作。因为是上星期,所以用过去时

2. A

“直到我们准备离开,那个孩子才回来”也就是,在我们准备离开之前,那孩子没有回来

3.A
他是第二,只比第一拉后几米
behind指位置靠后 after指时间

1 B. was at work

2 A.before - 换until

3 A.behind

B
A
A