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It was not until the 1990s ________ industrial robots became really cheap, and therefore a possible option.
It was not until the 1990s ________ industrial robots became really cheap, and therefore a possible option.
admin
2019-09-23
63
问题
It was not until the 1990s ________ industrial robots became really cheap, and therefore a possible option.
选项
A、which
B、who
C、whom
D、that
答案
D
解析
根据语法,空格处应填入that构成强调句型。故选D。
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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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