he asked nothing because he was able to understand what they had talked about.
题目
he asked nothing because he was able to understand what they had talked about.
He asked nothing because he was able to understand what they had talked about.
A.must B.was able to C.can D.may
答案
be able to 是能够做某事,must是必须,
这里是过去时态,所以不能用can和may
结合语境应该是选B
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
最新试题
热门考点