Did you have anyone ____the classroom?
题目
Did you have anyone ____the classroom?
Yes,I had the classroom( )
A.to clean,clean B.clean,cleaned
答案
B.clean,cleaned
have sb do sth让某人做某事
have sth done让某事被做
句意为:你让某人打扫教室了吗?
是的,已经打扫好了.
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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