He was seen ------------the building.A to enter B enter Centers Dentered
题目
He was seen ------------the building.A to enter B enter Centers Dentered
答案
A
本来是 see sb.do sth
但在被动语态中,to 要还原,也就是要加个to
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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