单项选择题

has been done to prevent the water in the lake from being polluted.()

A. Little
B. Few
C. Other
D. Many

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单项选择题
The conference was organized for all the () in the city

A. mathematics teacher
B. mathematic teachers
C. mathematics teachers
D. mathematic's teachers
单项选择题
The questions()in English.

A. answer
B. must answer
C. must be answered
D. can answer
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