【题目】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
在线课程【答案】B
【解析】
试题分析：A.after在...之后 B.before在...之前 C.因为 D.when引导时间状语从句。句意：科学家说将这种药品应用于人类身上的可能性将会在5—6年内实现。
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Scientists say it will be five or six years it is possible to test this medicine on humans．A.after B
编辑：chaxungu时间：2026-04-27 02:59:08分类：高中英语题库
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