Scientists say it may be five or six years _____ it is possible to test this medicine to human patients.
A．since B．a(chǎn)fter C．before D．when
C

試題分析：考查固定句型：It will be/may be+一段時(shí)間+before表示要過多長(zhǎng)時(shí)間才做某事，由此題看是填before,意思是:科學(xué)家說要過五年或十年才能在人身上試驗(yàn)這藥.選C。
點(diǎn)評(píng)：表示“要過多久才…” …”， 一、用于句型“It + will be + 時(shí)間段 + before...”句型中，表示“也許要過多久才……”也可用于“It + may be + 時(shí)間段 + before...” Before 后的句子中用一般現(xiàn)在時(shí)態(tài)。其否定形式“ +時(shí)間段 before…”表示“不久就…… 時(shí)間段+ …”
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