The revolution of machinery could __________without a new source of both movable and constant power in the new century.A. be born B. not have been born C. have been born D. have born
The revolution of machinery could __________without a new source of both movable and constant power in the new century.
A. be born
B. not have been born
C. have been born
D. have born
B. not have been born
C. have been born
D. have born
参考解析
解析：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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