Scientists say it may be one year or so it is possible to test the new medicine on human patients.A．whenB．afterC．beforeD．since 题目和参考答案——青夏教育精英家教网—

题目内容

Scientists say it may be one year or so ________ it is possible to test the new medicine on human patients.

A．when

B．after

C．before

D．since

词义辨析。句意：科学家们说在有可能把这种新药用于人类前可能需要大约一年的时间。所以选C。

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