Question

【题目】We can save water by ________ rubbish into the river.

A.not throwB.to throwC.throwingD.not throwing

Answer 1

【答案】D

【解析】

句意：我们可以通过不往河里扔垃圾来节约水。

本题卡车非谓语动词。not throw是动词原形；to throw是动词不定式，throwing是动名词；not throwing是动名词的否定形式。by doing sth通过做某事，排除AB两项。结合句意we can save water表示要节约水，应是不往河里扔垃圾，故选D。