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【题目】Scientists say it may be a few years ______ it is possible to test the new medicine on patients.
A.because
B.after
C.since
D.before

【答案】D
【解析】考查固定句型的应用。句意:科学家说,在能够对人类进行药物试验之前,可能要经过5或6年.it may be+一段时间+ before 表示在···之前要经过多长时间。

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