What was he doing at seven p.m.yesterday evening?该怎么回答?
题目
What was he doing at seven p.m.yesterday evening?该怎么回答?
答案
He was doing xxx at seven p.m.yesterday evening.
因为有具体的时间点,故用过去进行时.
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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