Scientists say it may be one year or so ________ it is possible to test the new - 高中英语试题 - 超级试练试题库

题目

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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

答案

解析

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。

核心考点

试题【Scientists say it may be one year or so ________ it is possible to test the new 】；主要考察你对连词等知识点的理解。[详细]

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