The policeman asked him ___ when the accident happended.
题目
The policeman asked him ___ when the accident happended.
A what was he doing
B what did he do
C what he was doing
D what he did
答案
C 宾语从句,语序不变
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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