这题应该在C和D之间考虑.
如果选择D,不定式表示目的,是可以说得通的,但是句子里的sign是“标志”的意思,也就是：让同学们别浪费纸,不是我们来执行,而是指“标志”的内容.
这样就可以理解了：后面是个现分作后置定语.换成定语从句就是：
a sign which asks our classmate not to.把定语从句换成非谓语动词,我们以前讨论过的.
选择C.
We should do something to improve our environment.---Good id
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