.Every possible means .However nothing can him dying of cancer.A. has tried; stopB. have

问题补充：

.

Every possible means .However, nothing can him dying of cancer.

A. has tried; stop

B. have tried; keep

C. has been tried; prevent

D. have been tried; prevent

答案：

A. has tried; stop

B. have tried; keep

(答案→)C. has been tried; prevent

D. have been tried; prevent

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