It was Mr. Zhang that helped us out of the trouble. Without his help, we it so easily.
A. can’t manage
B. mustn’t have managed
C. couldn’t have managed
D. couldn’t manage
网友回答
A. can’t manage
B. mustn’t have managed
(答案→)C. couldn’t have managed
D. couldn’t manage
解析：考查虚拟语气。虚拟语气分为if引导的虚拟条件句，含蓄条件句和混合虚拟语气。without没有，后跟含蓄条件句，相当于if it was not for...。根据helped可知，是发生过的事情，对过去虚拟，主句用would/could/should have done。故选C。