12. But for your help Ithe exam.A. mustn’t have passedB. couldn’t passC. wouldn’t have pa

问题补充：

12. But for your help, Ithe exam.

A. mustn’t have passed

B. couldn’t pass

C. wouldn’t have passed

D. hadn’t passed

答案：

A. mustn’t have passed

B. couldn’t pass

(答案→)C. wouldn’t have passed

D. hadn’t passed

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