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

A. since B. after C. before D. When

【答案】C

【解析】

試題分析：考查連詞。句意：科學(xué)家說(shuō)這種藥物在可以試驗(yàn)在人類(lèi)身上之前還有5或6年。 A. since既然；B. After之后；C. Before之前；D. When當(dāng)...時(shí)；根據(jù)句意可知是能夠試驗(yàn)之前還有5.6年，故選C項(xiàng)。

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