问题描述：
Everyone can help to save paper.If we all ___ ,we can help protect trees .
A think carefully B think over it
C think it about D think careful
最好能指点一下不能选其他项的理由
A think carefully B think over it
C think it about D think careful
最好能指点一下不能选其他项的理由
问题解答：
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