The revolution of machinery could __________without a new source of both mova...

作者: tihaiku 人气: - 评论: 0

问题 The revolution of machinery could __________without a new source of both movable and constant power in the new century.

选项 A. be born B. not have been born C. have been born D. have born

答案 B

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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