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

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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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There’sagoodantiquesmarkethere______Sundays.A、overB、byC、inD、onD句意：每到星期日