【題目】Scientists say it may be five or six years _______ it is possible to test this medicine on human patients.

A.beforeB.afterC.whenD.since

【答案】A

【解析】

句意：科學(xué)家們表示，在人類患者身上測試這種藥物可能需要五六年的時間。

考查從屬連詞。before……才，……就；after在……之后；when當(dāng)……時候；since由于，自從；根據(jù)it was+段時間+before結(jié)構(gòu)的意思是：“距離(發(fā)生某事)有多長時間”，但表達(dá)的是過去的事情。其中before是從屬連詞，表示“……才；……就”，引導(dǎo)時間狀語從句。故選A。

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