问题补充:
Thank you for all your hard work last week.I don’t think we it without you.
A. can manage
B. could have managed
C. could managed
D. can have managed
答案:
A. can manage
(答案→)B. could have managed
C. could managed
D. can have managed
解析:由语境可知这里要表达的意思是:如果没有你们辛勤的工作,我们不可能处理好这件事。很显然,这是对过去发生的事实的虚拟,所以要用could have done,故应选B。