题目内容
Scientists say it may be a few years _____ it is possible to test the new medicine on patients.
A. because B. after C.before D. since
C
【解析】本题题意为“科学家们说也许再过几年才有可能在病人身上测试这种新药。”考查连词的用法。由题意可知答案为C。
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