单项选择题

Though chess players may now compete against computers, they still follow rules that were used over 800 years ago.

A. come after
B. abide by
C. recite
D. allow
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Yesterday, I encountered one of my old friends on the street by chance.
A. incidentally
B. eventually
C. temporarily
D. accidentally
单项选择题
My brother' s plans are very ambitious.
A. arbitrary
B. aggressive
C. adequate
D. abundant
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