you should understand the traffic rule by now.---you are had it ____often enough.
题目
you should understand the traffic rule by now.---you are had it ____often enough.
A expaining
B to explain
C explain
D explained
为什么选D?
是不是什么固定搭配,那么当have sth一定是done吗?怎么看?
答案
have sth done 可表示让某物被怎样
如果是人,可以用have sb do
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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