6._____writer is better known in China，Charcles Dickens or Mark Twain?

A.Which B. What C. Either D. Whether

6.A【解析】特殊疑问句中的选择，用which。

7. ---Have you seen Tom and Mary? ---I haven' t seen _____of them.

A.neither B. any C. either D. all

7.C【解析】前一句只提到两个人。neither，either，both仅用于表述两者的情况，而any，all表述多者的情况，且I haven't seen either of them相当于I have seen neither of them。

8.Is _____necessary to complete the design before National Day?

A.this B. that C. it D. he

8.C【解析】it是形式主语，to不定式是真正主语。

9.All _____is needed is a supply of oil. 

A.the thing B. that C. what D. which

9.B【解析】all是先行词，that 引导定语从句，且all that=what。

10.His camera is more expensive than ______. 

A.hers B. her C. it D. its

10.A【解析】His camera是句子的主语，也是信息词，应填名词性的物主代词hers，它相当于her camera。

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