Never before______ so highly successful in his attempts to forecast the weather accurately on a small scale．
A．man has beenB．man is C．has man beenD．will be man
C
（考查時(shí)態(tài)和倒裝句型。never置于句首時(shí)句子要倒裝。never before用于現(xiàn)在完成時(shí)，因此答案為C。）
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