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The new drug will not be put on the market______ it has proved safe on humans,A、
The new drug will not be put on the market______ it has proved safe on humans,A、
游客
2024-06-28
13
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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
分析句子可知,此处需要使用时间状语从句形式,not一词经常和until一起使用,意为“直到……才……”,该结构经常用来引导时间状语,所以B)为正确答案。
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