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This problem may lead to more serious ones if D unsolved.x0
题目内容：
This problem may lead to more serious ones if _D___ unsolved.\x05
A.making\x05 B.remained\x05 C.keeping \x05D.left
这题为什么不能选B
To what extent will future scientific discoveries ___B_____ the prolonging of human life?
A.be made possible B.make possible
C.make it possible D.be made it possible
为什么不选C?
This problem may lead to more serious ones if _D___ unsolved.\x05
A.making\x05 B.remained\x05 C.keeping \x05D.left
这题为什么不能选B
To what extent will future scientific discoveries ___B_____ the prolonging of human life?
A.be made possible B.make possible
C.make it possible D.be made it possible
为什么不选C?
A.making\x05 B.remained\x05 C.keeping \x05D.left
这题为什么不能选B
To what extent will future scientific discoveries ___B_____ the prolonging of human life?
A.be made possible B.make possible
C.make it possible D.be made it possible
为什么不选C?
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