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
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(答案→)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
解析：考查倒装句和so,such的辨析。当never,little hardly,scarely等否定意义的副词置于句首句子要倒装。So+adj/av+n.而such+a(n)+adj.+n