【題目】It's necessary for us (protect) the environment.

【答案】to protect
【解析】句意:保護(hù)地球?qū)ξ覀儊?lái)說(shuō)是有必要的。it is adj. for sb to do sth是不定式作主語(yǔ)時(shí)的一種結(jié)構(gòu),譯為“做某事對(duì)某人來(lái)說(shuō)怎么樣”,所以答案是to protect。

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