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Scientists say it may be five or six years it is possible to test this medicine

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Scientists say it may be five or six years it is possible to test this medicine

Scientistssay it may be five or six years __________it is possible to test this medicineon human patients.

A.since      B.after

C.before D.when

 

试题答案

答案：C

提示：
it+be+其他成分＋before+其他成分句式。

 

标签：sixoryearspossibleis

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