单项选择题

Generally speaking, this article is about()

A. a riverboat pilot
B. a printer
C. a gold miner
D. a famous writer

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单项选择题
21()

A.either 
B.so 
C.nor 
D.never
多项选择题
()is terribly tiring working late like()

A. This ; it
B. It ; this
C. What ; it
D. It ; what
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