单项选择题

Chopsticks of bamboo or wood can be bought in ()of pairs; 10 is the usual number

A、bunches
B、bundles
C、units
D、pieces
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单项选择题
There were five hundred ()at the state unified examination of CET-4in our university last year.
A、applicants
B、attendants
C、participants
D、candidates
单项选择题
They had to decide whether they should ()some classes.offB、call onC、call upD、call in
A、call
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