Seing John run into the room,Iasked him what___
题目
Seing John run into the room,Iasked him what___
A would happened B had happened
C happened D was happened
答案
选B
过去完成时,因为主句是一般过去时,所以从句要退一格
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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