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Without computers ,we ____the tremendous medical advancement

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Without computers ,we ____the tremendous medical advancement in the last few decades
Awould not make Bcouldn't have made 为什么不能选择A
Without computers ,we ____the tremendous medical advancement
因为题中有时间状语提示词
the last few decades,说明是对过去的虚拟,所以得用could would 加完成时,而A是对现在的虚拟