争议题There were five people in the car but they still took me.— It _____ a comfortable journey.
题目
争议题There were five people in the car but they still took me.— It _____ a comfortable journey.
A.can't be
B.shouldn't be
C.mustn't have been
D.couldn't have been
A还是D,为什么
答案
D 前面句子是一般过去时表示事情发生在过去.could + have+动词过去分词 表示与过去事实相反.
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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