【題目】Scientists say it will be five or six years ________ it is possible to test this medicine on humans．

A．after B．before C．since D．When

【答案】B

【解析】

試題分析：A.after在...之后 B.before在...之前 C.因?yàn)?/span> D.when引導(dǎo)時(shí)間狀語(yǔ)從句。句意：科學(xué)家說(shuō)將這種藥品應(yīng)用于人類身上的可能性將會(huì)在5—6年內(nèi)實(shí)現(xiàn)。

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