摘要：24．Never before so highly successful in his attempts to change the weather slightly on a very small scale． A．man has been B．man is C．will man be D．has man been
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Never before _____ so highly successful in his attempts to change the weather slightly on a very small scale.
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A. man has been
B. man is
C. will man be
D. has man been
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B. man is
C. will man be
D. has man been