I____have failed the exam without your help.

问题描述:

I____have failed the exam without your help.
A.should B.shall C.might D.will

C.might have done 的意思是过去可能做过某事.句意:如果没有你的帮助我看能救考试不及格了.should have done是过去本应该做而没做的意思(指有义务做);shall不能和have done搭配;will也不能和have done搭配,只能...