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单项选择题

The drinking water is contaminated with impurities.

A. blackened
B. polluted
C. darkened
D. mixed
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热门试题

单项选择题She is very conscientious about her work.

A. worried
B. careful
C. anxious
D. nervous

单项选择题She has consolidated her power.

A. strengthened
B. won
C. hardened
D. united