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

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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