Did he come back early?
题目
Did he come back early?
Yes.It was not yet eight o'clock ___ he arrived home
A before B when
选B 为什么不选A
答案
when引导的时间状语从句表示的是一个时间点,主句可以是一个确切的时间,而before则不可．
如：It was just ten when he went to bed last night.
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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