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问题: 请教英语问题

24. This matter is very urgent. Please deal with it ____.
A. straight off B. straight out C. straight up D. straight away
25. –Was he present at the wedding ceremony?
--He ____ not have attended it, for he was busy repairing his computer during that time。
A. can B. might C. should D. must
答案:DA
请说明答案被选择的原因,谢谢!

解答:

24. 事情很紧急,请立刻处理一下.straight away 毫不犹豫地; 立刻, 马上;straight out 坦白地, 率直地, 毫不犹豫地;straight up [俚]真的; 确实的

25.他不可能参加了,因为当时他正忙于修他的电脑
can可以和not一起表示否定的推测,意为"定不可能"
可能是第四个选项会造成困扰,但must只能用于肯定的推测.