We should do something to improve our environment.---Good idea.we can put up a sign__our classmatenot to waste paper.A ask B asked C asking D to ask选哪个？

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• We should do something to improve our environment.---Good idea.we can put up a sign__our classmatenot to waste paper.A ask B asked C asking D to ask选哪个？
• We should do something to improve our environment.---Good idea.we can put up a sign__our classmatenot to waste paper.A ask B asked C asking D to ask选哪个？谢谢
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• 将句子转化为被动语态.We should do something to improve our environment看补充1.We should do something to improve our environment.( ) ( ) ( ) ( ) to improve our environment.