he with his family have gone to canada
题目
he with his family have gone to canada
改错
答案
改为has gone
主语是he,是单数
句子可以理解为he has gone to canada with his family 这样比较容易分析
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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