The children have to do their homework the moment they ___back from school
题目
The children have to do their homework the moment they ___back from school
A.will arrive B.will have arrived C.would arrive D.have arrived
答案
D.have arrived,主句现在时,从句现在完成时,从句先于主句发生,孩子们一回家（先发生）,就做作业（后发生）
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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