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外语
They repeated the experiment several times ______ they were sure that the result was reliable.
They repeated the experiment several times ______ they were sure that the result was reliable.
admin
2014-02-19
21
问题
They repeated the experiment several times ______ they were sure that the result was reliable.
选项
A、until
B、for
C、since
D、when
答案
A
解析
until引导时间状语从句,表示动作持续到某一时间点。其他选项不合题意。例如:He waited for his friend at the bus stop until the last bus came.(他在车站等他的朋友,一直等到最后一班车来。)
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大学英语三级B级题库大学英语三级分类
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大学英语三级B级
大学英语三级
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