Neverbefore______sohighlysuccessfulinhisattemptstoforecasttheweatheraccuratelyonasmallscale．
A.man has beenB.man isC.has man beenD.will be man在线课程C
解析：
（考查时态和倒装句型。never置于句首时句子要倒装。never before用于现在完成时，因此答案为C。）
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