According to what he complained about, something must have gone wrong with the computer, ______?
题目
According to what he complained about, something must have gone wrong with the computer, ______?
1 According to what he complained about, something must have gone wrong with the computer,
______?
A. mustn't it B. didn’t he C. hasn’t he D. didn’t it
答案D,说下理由
答案
must 用来表示猜测 时,其反义疑问句的助动词须与原先的助动词相同
此句中,因为是过去时,have 应该用did
再如
he must be working right now, isn't he?
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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