These three college students are real heroes because they risked ______their own lives in order to s
题目
These three college students are real heroes because they risked ______their own lives in order to save the drowning boys in the water.
A.having lost B:to lose C.losing D.of losing
是risk doing形式,为啥选a不行,不是过去发生的事吗
答案
因为如果使用完成时态,不能用risk having done,而应该用 have risked doing这样的形式.
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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