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We must do everything we can _________ our earth clearer and safer.

A.madeB.to makingC.makeD.to make

D

解析試題分析:根據語境可知此句的含義是我們必須竭盡全力來讓我們的地球更清新更安全。考查的是動詞不定式做目的狀語。故選D。
考點:動詞不定式做目的狀語
點評:不定式和不定式短語作目的狀語,主要用來修飾動詞,表示某一動作或狀態的目的。為了使目的意義更加清楚或表示強調意義時,還可以在前面加 in order to 或 so as to。

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