Scientists say it may be five or six years _______ it is possible to test this medicine on human patients.A．sinceB．afterC．beforeD．when-高中英语-n多题

◎ 题干

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

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◎ 解析

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◎ 知识点

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