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【题目】It is important for us to work on the earth.

A.protectB.to protectC.protectingD.protected

【答案】C

【解析】

句意:对我们来说致力于保护地球很重要。

考查非谓语动词。A. protect保护,动词原形;B. to protect动词不定式;C. protecting动名词形式;D. protected动词的过去式。work on doing sth.意为"致力于做某事"。故选C

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