【題目】Scientists say it may be a few years ______ it is possible to test the new medicine on patients．

A．becauseB．a(chǎn)fter

C．sinceD．before

【答案】D

【解析】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(yàn)之前,可能要經(jīng)過5或6年．it may be+一段時(shí)間+ before 表示在···之前要經(jīng)過多長時(shí)間。

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