both men genuinely regretted___ 1 their leave 2 to have to leave
题目
both men genuinely regretted___ 1 their leave 2 to have to leave
3 having to leave 4 they must have left
选择哪一个,及为什么
答案
2 to have to leaveregret to do sth 后悔去做某事,还未做.
regret doing sth 后悔做过某事 做过了.
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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