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It will be many years the doctors and medical scientists can find for cancer. A

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It will be many years the doctors and medical scientists can find for cancer. A

It will be many years ______ the doctors and medical scientistscan find _____ for cancer.

    A . since;cures             B. when; treatments 

C. before;cures            D. until; treaments

 

试题答案

【答案】

C

【解析】略