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Never before in our country_____.

A. has such a thing happened           B. such a thing has happened

C. has so a thing has happened          D. so a thing has happened

A


解析:

考查倒裝句和so,such的辨析。當never,little hardly,scarely等否定意義的副詞置于句首句子要倒裝。So+adj/av+n.而such+a(n)+adj.+n

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