We must do everything we can our earth clearer and safer.A. madeB. to makingC. makeD. to

问题补充：

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

A. made

B. to making

C. make

D. to make

答案：

A. made

B. to making

C. make

(答案→)D. to make

解析：根据语境可知此句的含义是我们必须竭尽全力来让我们的地球更清新更安全。考查的是动词不定式做目的状语。故选D。