The new drug will not be put on the market ____ it has proved safe on humans.

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问题 The new drug will not be put on the market ____ it has proved safe on humans.

选项 A、if
B、until
C、since
D、when

答案B

解析

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本试题收录于：浙江省大学英语三级题库大学英语三级分类

浙江省大学英语三级

大学英语三级

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VeterantracktrainerJohnsonisscathinginhis______oftheleadersoftheI.O.C.,"Thesepeoplearemegalomaniacs.Theyare

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