【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(yīng)用。句意:科學(xué)家說(shuō),在能夠?qū)θ祟愡M(jìn)行藥物試驗(yàn)之前,可能要經(jīng)過(guò)5或6年.it may be+一段時(shí)間+ before 表示在···之前要經(jīng)過(guò)多長(zhǎng)時(shí)間。

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