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1. Is oxygen the only gas _______ helps fire burn?
A. that
B. /
C. which
D. it
答案： A.
解析：先行词gas被the only修饰，关系代词要用that，而不用which。
2. 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.
中公专家解析：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。
2. 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.
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。
3. John got beaten in the game, _______ had been expected.
A. as
B. that
C. what
D. who
答案：A。
解析：as引导非限制性定语从句，意思是：“正如”。
4. I have bought two ball pens, _______ writes well.
A. none of them
B. neither of them
C. neither of which
D. none of which
答案：C.
解析：因为是two ball pens, 并且定语从句的谓语writes是单数概念。因此，C是正确选项。
5. All that can be eaten _______ eaten up.
A. are being
B. has been
C. had been
D. have been
答案：B.
解析：本句话中，主句的主语是all, 为抽象概念。因此，其谓语应用单数的has been。关系代词that引导定语从句，并在从句中作主语。
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