(2017·安庆四中月考)It ________ discovered ________ the 17th century. A. wasn’t; until B. didn’t; until C. ...
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题目内容：
(2017·安庆四中月考)It ________ discovered ________ the 17th century.
A. wasn’t; until B. didn’t; until
C. didn’t; before D. doesn’t; till
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