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1. --- Did you ask the guard _______ happened?
--- Yes, he told me all _______ he knew.
A. what; that
B. what; what
C. which; which
D. that; that
答案： A.
专家解析：what happened是宾语从句，作ask 的直接宾语，all 之后that he knew是定语从句.先行词是all,所以关系代词只能用that。所以答案选A。
2. I shall never forget those years _______ I lived on the farm with
the farmers, _______ has a great effect on my life.
A. when; who
B. that; which
C. which; that
D. when; which
答案：
D. 专家解析：years是表示时间的名词,用when引导定语从句,是因为when在从句中作时间状语.第二个空选用which,引导一个非限制性定语从句.
3. The number of the people who _______ cars _______ increasing.
A. owns; are
B. owns; is
C. own; is
D. own; are
答案：C.
专家解析：本句话的定语从句是who own cars. 其先行词是people,因此,定语从句的谓语动词要用复数的own。本句话主句的主语是The number of指“…..的数目”，是单数概念。因此，主句的谓语动词要用is。
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