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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
2023-09-21
58
管理
问题
The new drug will not be put on the market _____ it has proved safe on humans.
选项
A、when
B、until
C、since
D、if
答案
B
解析
本题考查until的用法。分析句子可以发现,空格前的动作要以空格后的动作为条件,not…until意为“直到……才……”的意思,正好能表达这种条件/时间关系,故本题答案为B。
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