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

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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浙江省大学英语三级

大学英语三级

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