39. Thank you for your help. for your help I wouldn’t have succeeded in my experiment.A.

问题补充：

39. Thank you for your help. for your help, I wouldn’t have succeeded in my experiment.

A. If it is not

B. Were it not

C. Had it not been

D. If they were not

答案：

A. If it is not

B. Were it not

C. Had it not been

D. If they were not

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