Scientists say it may be a few years___it is possible to tes

Scientists say it may be a few years___it is possible to test new medicine on patients
A.because B.after C.before D.since

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选C.考查的句型：it will be +一段时间 before …… 表示过了多久才意思是科学家说,它可能是在几年前是有可能对患者进行测试新药.
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C.before

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before

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C. before

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选C。考查的句型：it will be +一段时间 before …… 表示过了多久才

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