-How long can I keep this book?-It must ___ (return) by Wednesday.
题目
-How long can I keep this book?-It must ___ (return) by Wednesday.
答案
你好楼主,
值此中秋佳节,我衷心祝你快乐.
此处应该填 be returned
因为是被动语态的啦
还有问题可以问我~~~
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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