We shall ask for samples ____ and then we can make our decision.
题目
We shall ask for samples ____ and then we can make our decision.
A. to be sent B. being sent C. to sent D. to have been sent
答案
A.to be sent 标本是要被送来的,所以要用不定式(表将来)的被动语态.
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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