―The river runs clear.
―We all appreciate the importance the local government has the environmental protection.
A. attached to
B. left for
C. responded to
D. learnt from
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(答案→)A. attached to
B. left for
C. responded to
D. learnt from
解析：attach …to依附，把……放在；leave for动身去；respond to回答；learn from向……学习。句意:--这条河真清澈。--我们都很感激政府重视了环境保护。故选A。