【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.因為 D.when引導時間狀語從句。句意：科學家說將這種藥品應(yīng)用于人類身上的可能性將會在5—6年內(nèi)實現(xiàn)。

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