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
21（）

A．studied
B．bought
C．taught
D．thought
单项选择题
22（）

A．many ways
B．in many ways
C．a better way
D．plenty of ways
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