【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】

試題分析:考查固定句型的應(yīng)用。句意:科學(xué)家說,在能夠?qū)θ祟愡M(jìn)行藥物試驗之前,可能要經(jīng)過5或6年.it may be+一段時間+ before 表示在···之前要經(jīng)過多長時間。

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