单项选择题

It pays ______ to buy goods of high quality.

A. in the long run
B. in the short run
C. at a run
D. on the run
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单项选择题
Students will be ______ admittance to their classroom if they are not properly dressed.
A. declined
B. deprived
C. denied
D. deserted
单项选择题
I think you are supposed ______ your graduate study last year.
A. to be finishing
B. to have finished
C. to finish
D. to have been finished
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