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一道英语选择题Never before so highly successful in changing his sur

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一道英语选择题
Never before so highly successful in changing his surroundings.
A.man has been B.man is C.has man been D.is man
我知道要用倒装,C D 都是倒装,选哪项?
拜托各位讲到重点行吗? before 在这里作什么成分?状语吗?
c
把句子还原
man has never been so highly successful in changing his surroundings before
before是状语,以前
他以前从没有那么成功过,以前指的也就是至今为止,这次最成功
要用现在完成时
never否定词放在句首,句子部分倒装
选c