一道英语题(虚拟语气)
题目
一道英语题(虚拟语气)
He ____ busy yesterday,or he ___ you with your experiment.
was,would have helped
答案
He __was__ busy yesterday,or he _would have helped __ you with your experiment.
前面的句子发生在过去,所以要用过去时态.后面是虚拟的,并没有发生,所以用would have done
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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