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【題目】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】考查固定句型的應用。句意:科學家說,在能夠對人類進行藥物試驗之前,可能要經過5或6年.it may be+一段時間+ before 表示在···之前要經過多長時間。

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