If the rules of perspective had not been discovered, no one able to paint such realistic——青夏教育精英家教网—

摘要： If the rules of perspective had not been discovered, no one able to paint such realistic pictures. A. would be B. would have been C. should be D. should have been

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If the rules of perspective ________ , no one would have been able to paint such realistic pictures．

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A．did not discover

B．were not discovered

C．had not discovered

D．had not been discovered

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