i thought you (have/were having/are having) a break now but you are still studying now. which one?
题目
i thought you (have/were having/are having) a break now but you are still studying now. which one?
答案
were having 前面是过去式,后面的从句中也应该用过去式,另外,这是一句和现实相反的虚拟语句,也说明要用过去式
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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