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The new drug will not be put on the market ____ it has proved safe on humans.A、i
The new drug will not be put on the market ____ it has proved safe on humans.A、i
游客
2024-08-03
33
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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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