We don't know what should ____to stop people _____rubbish about.A.to do ,throwing B.do,from throwing C.to do,throwing D.be done ,throwing

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We don't know what should ____to stop people _____rubbish about.A.to do ,throwing B.do,from throwing C.to do,throwing D.be done ,throwing
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We don't know what should ____to stop people _____rubbish about.A.to do ,throwing B.do,from throwing C.to do,throwing D.be done ,throwing
We don't know what should ____to stop people _____rubbish about.
A.to do ,throwing B.do,from throwing C.to do,throwing D.be done ,throwing

We don't know what should ____to stop people _____rubbish about.A.to do ,throwing B.do,from throwing C.to do,throwing D.be done ,throwing
选D be done, throwing

第一个空当中,should后面直接动词原形,根据句意填写do;第二个空中,根据前面的stop,可以判断后面要跟doing结构,所以答案是B。

D正确。

意思:我们不知道该做什么才能阻止人们乱丢垃圾。

what we should do 是主动形式,改为被动就是:what should be done