单项选择题

One of the real services of the historical novel is not that it can be a substitute for history, but that it can be a(n) extension（）

A. compliment
B. supplement
C. instrument
D. replacement

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单项选择题
Peter was seen crying when he came out of the office. We can deduce that he must have been punished（）

A. confer
B. refer
C. prefer
D. infer
单项选择题
The whole program is well designed, but some details need further（）by some experts.

A. proofing
B. modifying
C. demonstrating
D. polishing
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