单项选择题

You must shine your shoes.

A. lighten
B. clean
C. wash
D. polish
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单项选择题
Practically all species of animals communicate either through sounds or through a large repertory of soundless codes.
A. Simultaneously
B. Almost
C. Absolutely
D. Basically
单项选择题
I rarely wear a raincoat because I spend most of my time in a car.
A. normally
B. seldom
C. continuously
D. usually
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