Thank you for all your hard work last week.I don’t think we it without you. A. can manage

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。