Congratulations! -Thank you. If it hadn’t been for your help we in the experiment

问题补充：

--- Congratulations!

---Thank you. If it hadn’t been for your help, we in the experiment.

A. will never succeed

B. wouldn’t have succeeded

C. mustn’t have succeeded

D. can’t have succeeded

答案：

A. will never succeed

(答案→)B. wouldn’t have succeeded

C. mustn’t have succeeded

D. can’t have succeeded

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