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4.Do you know the year ______the Chinese Communist Party was founded?
A. which
B. that
C. when
D. on which
答案：C.
欣瑞专家解析： when是关系副词，表示时间，在定语从句中作时间状语。Do you know the year when/in which the Chinese Communist Party was founded? D项介词用错，和年搭配的介词是in。
5.That is the day ______I'll never forget.
A. which
B. on which
C. in which
D. when
答案：A.
欣瑞专家解析： which是关系代词，在从句中作forget的宾语。这个定语从句可以表述为：That is the day that/which/不填I'll never forget..。
6.The factory ______we'll visit next week is not far from here.
A. where
B. to which
C. which
D. in which
答案：C.
欣瑞专家解析：句意为;我们下周要去参观的工厂离这儿不远。定语从句的关联词有三种填法，具体为：The factory that/which/不填we'll visit next week is not far from here
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