the child has made so much noise that he should not have been allowed to attend the concert.
题目
the child has made so much noise that he should not have been allowed to attend the concert.
如何翻译,是什么时态,为什么allow是过去时.
答案
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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