The coffe is wonderful .It does not taste like anything I_ _ before.
题目
The coffe is wonderful .It does not taste like anything I_ _ before.
A was having B have C have ever had D had ever had cd的不同 为什么不选d
答案
根据句子意思用的应该是一般完成时,而D是过去完成时
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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