what a nice watch .thanks.i[ ]it for two years.a.will buy b.did buy c.have had d .have bought
题目
what a nice watch .thanks.i[ ]it for two years.a.will buy b.did buy c.have had d .have bought
答案
C HAVE HAD --------强调时间段,到目前位置,就用现在完成时
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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