单项选择题

A．used
B．contained
C．dominated
D．belonged
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单项选择题
A．commonB．usefulC．importantD．difficult
A．common
B．useful
C．important
D．difficult
单项选择题
In a big university, what may several thousand students be taking at the same time
A．Arts and sciences.
B．Geometry.
C．A compulsory course.
D．A course in poultry marketing.
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