一道英语选择题Since I last met Tom in Beijing,I never saw him again,nor____ from him.
题目
一道英语选择题Since I last met Tom in Beijing,I never saw him again,nor____ from him.
A.did I hear B.I heard C.had I heard D.I had heard
答案
选c nor开头的用倒装可以排除bd 然后句意是自从我上次在北京见过汤姆我再也没有见过他 也没有过他的消息 过去完成时 所以用had
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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