问题描述：
To what extent will future scientific discoveries ____the prolonging of human life?
A.be made possible B.make possible C.make it possible D.be made it possible
答案是B,可是为什么,我不懂?急求详解,谢谢!
A.be made possible B.make possible C.make it possible D.be made it possible
答案是B,可是为什么,我不懂?急求详解,谢谢!
问题解答：
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