That was the steepest mountain they had ever climbed
题目
That was the steepest mountain they had ever climbed
A.would climb B.have climbed C.had ever climbed D.was climbing
给理由!
奥，错了
That was the steepest mountain they _________
答案
前句:past tense
后句past perfect tense
＋ever加重语气
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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