I_ a lot there days as a consequence of the sudden change of the weather,so I have to see the doctor
题目
I_ a lot there days as a consequence of the sudden change of the weather,so I have to see the doctor this afthernoon a.coughed b.have been coughing c.will cough d.had coughed
答案
选b 现在完成进行时 表从过去持续到现在或将来继续的动作.
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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