[题目]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 题目和参考答案——青夏教育精英家教网—

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【题目】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】

试题分析：考查连词。句意：科学家说这种药物在可以试验在人类身上之前还有5或6年。 A. since既然；B. After之后；C. Before之前；D. When当...时；根据句意可知是能够试验之前还有5.6年，故选C项。

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