一道初三英语单选Scientist say it may be a few years ____ it is possible to test the new medicine on patient A.because B.after C.before D.since

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一道初三英语单选Scientist say it may be a few years ____ it is possible to test the new medicine on patient A.because B.after C.before D.since

一道初三英语单选Scientist say it may be a few years ____ it is possible to test the new medicine on patient A.because B.after C.before D.since
一道初三英语单选
Scientist say it may be a few years ____ it is possible to test the new medicine on patient
A.because B.after C.before D.since

一道初三英语单选Scientist say it may be a few years ____ it is possible to test the new medicine on patient A.because B.after C.before D.since
C.
表示时间的对比,现在与后几年.
翻译：新药给病人用还要再过几年.

C.before

选C，再过几年这种药才可用于临床

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