【題目】We must do everything we can ________ our earth cleaner and safer.

A. made B. to making C. make D. to make

【答案】D

【解析】

試題分析：根據(jù)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。本句中的we can作everything的定語，本題考查的是動詞不定式做目的狀語。故選D。

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