(Few of the people) in that area realize (the importance of) protecting the environment, (either do they know how) to do (so).

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问题 (Few of the people) in that area realize (the importance of) protecting the environment, (either do they know how) to do (so).

选项 A、Few of the people
B、the importance of
C、either do they know how
D、so

答案C

解析
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