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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.
admin
2015-08-03
32
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。
转载请注明原文地址:https://kaotiyun.com/show/MCiK777K
本试题收录于:
大学英语三级A级题库大学英语三级分类
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大学英语三级A级
大学英语三级
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