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
There is an abundant supply of cheap labor in this country.
A. a steady
B. a plentiful
C. an extra
D. a stable
单项选择题
Loud noises can be annoying.
A. hateful
B. painful
C. horrifying
D. disturbing
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