13.More teens are smoking in Beijing, ______ the number of primary and middle school students picking up the habit has more than doubled from previous years.
A. which B. when C. where D. that
【答案】 C
【解析】考查定语从句的关系词。Beijing 是先行词，在从句中做地点状语，因此用where引导定语从句。
14.Judging from his face_______ there was a confident smile, we knew that he didn’t lose heart.
A. in which B. from which C. by which D. on which
【答案】D
【解析】考查定语从句介词+关系代词的用法。a confident smile on his face.句意为：从他脸上自信的笑容来判断，我们知道他没灰心。故选D。
15.We have spotted the location, _______ we thought is the site of Emperor Qin Shihuang.
A. that B. what C. which D. where
【答案】C 考查定语从句。分析句子可知空格出引导定语从句，we thought 是插入语，从句缺少主语，应考虑用关系代词，又是非限制性定语从句，故选C。21世纪教育网
16.---When did the young man save you?
---January 1st,2000, the first day of the new century,_______ I can never forget.
A. when B. which C. that D. where
【答案】B
【解析】考查非限制性定语从句的关系词。先行词the first day在定语从句中作宾语。
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