The revolution of machinery could __________without a new source of both movable and constant power in the new century.
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B. not have been born
C. have been born
D. have born
参考答案:B
考查虚拟语气。当从句中出现without/ but for 等词时,主句要用虚拟语气,根据句意,如果没有新能源,机械改革不会诞生,再结合整句话的时态,应该用could not have been born。
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