英语28.My sister has never played badminton before.This is the first time she ________to play.
题目
英语28.My sister has never played badminton before.This is the first time she ________to play.
28.My sister has never played badminton before.This is the first time she ________to play.
A.is trying B.have tried C.has tried D.was trying
为什么
答案
固定句型It/This is the +序数词 time (that)sb. has done sth.
It/This was the +序数词 time (that)sb. had done sth.
(这是某人第几次做……)
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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