Thanks for your help John . We have finished our work so earlyyour help. A. can’t without

问题补充：

Thanks for your help, John . We have finished our work so

earlyyour help.

A. can’t without

B. couldn’t without

C. wouldn’t under

D. could by

答案：

A. can’t without

(答案→)B. couldn’t without

C. wouldn’t under

D. could by

解析：

这题考查虚拟语气：句意是：没有你的帮助我们不会这么早完成工作的。因为事实是，由于你的帮助，我们很早完成了工作，是和过去相反的虚拟语气，用couldn’t have done。选B。