【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】句意：我們必須做一切我們能做的事情讓我們的地球變得更干凈更安全。we can是定語從句，修飾everything，前省略了關(guān)系代詞that，can后省略了do。此處用不定式作狀語，修飾do。故選D。

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