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
Because of the popularity of the region, it is advisable to book hotels in advance.
A. possible
B. profitable
C. easy
D. wise
单项选择题
A great deal has been done to remedy the situation.
A. maintain
B. improve
C. preserve
D. protect
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