问题
选择题
It was so nice of you to come to our aid. I don’t think we ______ it without you.
A．can manage
B．could have managed
C．must have managed
D．could manage
答案
答案：B
题目分析：句意：你能来帮助我们真是太好了，我认为没有你我们不可能已经完成它。Could have done:可能已经做了某事 must have done:一定已经做了某事 根据句意可知表达一种对过去情况进行虚拟，故用could/would/might/should+have done。故选B。