单项选择题

All of the following words except ______ belong to the closed class.

A．them
B．which
C．unless
D．means
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单项选择题
The college with the longest history in America is ______.
A．Yale
B．Princeton
C．Harvard
D．Columbia
单项选择题
It was the expedition of ______ that led to Britain's claim to Australi
A． Abel TasmanB. George BassC. James CookD.W.
C．Wentworth
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