( ) Scientists say it may be a few years it is possible to test the new medicine on patien——青夏教育精英家教网—

摘要：( ) Scientists say it may be a few years it is possible to test the new medicine on patients. A. because B. after C. before D. since

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Scientists say it may be a few years _____ it is possible to test the new medicine on patients．

A. because B. after C．before D. since

Scientists say it may be a few years ______it is possible to test the new medicine on patients.

A.because B.after C.before D.since

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