Is this research center ______you visited the modern equipment last year?

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问题 Is this research center ______you visited the modern equipment last year?

选项 A、where
B、that
C、the one that
D、the one where

答案D

解析将疑问句改为陈述句：this research center is…显然缺少先行词，必须加上代词the one来作先行词，又因定语从句不缺主语或宾语，所以用关系副词where。

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中学英语

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