【題目】We must do something to stop people from _____.
A.to throw litter about
B.to throw litter into
C.throwing litter about
D.throwing litter into

【答案】C
【解析】句意:我們必須做一些事情來阻止人們亂扔垃圾。stop sb from doing sth阻止某人做某事。throw sth about到處亂扔。故選C。

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