【題目】Scientists say it may be two years ________ this new medicine can be tested on human patients.

A.beforeB.afterC.sinceD.when

【答案】A

【解析】

考查連詞。句意:科學(xué)家表示,這種新藥可能需要過(guò)兩年時(shí)間才能在人類(lèi)患者身上進(jìn)行測(cè)試。A. before 在……之前;B. after在……之后;C. since自……時(shí)候;D. when當(dāng)……時(shí)。本題考查It + be + some time + before從句,表示“多久之后才……”。故選A。

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