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4. During the days ________, he worked as a servant at the Browns.
A. followed
B. following
C. to follow
D. that followed
答案：D.
专家解析：that followed是定语从句，关系代词that在从句中作主语。
5. Is oxygen the only gas _______ helps fire burn?
A. that
B. /
C. which
D. it
答案： A.
专家解析：先行词gas被the only修饰，关系代词要用that，而不用which。
6. The clever boy made a hole in the wall, _______ he could see _____ was going on inside house.
A. which; what
B. through which; what
C. through that; what
D. what; that
答案：B.
专家解析：through which引导定语从句，through which即through the hole,在定语从句中作状语。What引导的是see的宾语从句，并作从句的主语。
7. Is _______ some German friends visited last week?
A. this school
B. this the school
C. this school one
D. this school where
答案：B.
专 家解析：为便于理解，改写本句话：This is the school that some German friends visited last week. 不难看出，作表语的the school是先行词。that引导了定语从句，因为that同时又作visited的宾语，所以被省略了。其它选项结构不对。
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