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
问题描述：
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
这里只要用一般过去时就可以了。
如果要用完成时，那也是在risk前面加had就好
答
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.