题目内容

Scientists say it may be five or ten years___________ it is possible to test this medicine on human patients.
A．sinceB．beforeC．afterD．when
B
本题是考查连词的用法。本题的关键是理解句子的含义：“科学家说还需要五到十年才有可能将药物在人体身上进行实验。”只有B选项符合题意。
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