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(shuō),在能夠?qū)θ祟?lèi)進(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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