单项选择题

You （） all those calculations! We have a computer to do that sort of thing.

A.needn't have done
B.must not have done
C.should not have done
D.can not have done

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单项选择题

According to the third paragraph, the Dictionary is reserved in （）.

A．public libraries only
B．libraries of colleges and companies only
C．every library worldwide
D．a number of libraries in the world

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