Question

We must do everything what we can _______ water and paper.

A．save

B．saving

C．to save

D．saved

Answer 1

C

试题分析：句意：我们必须做我们能做的一切来节约水和纸张。We must do everything what we can的目的是节约水和纸张，不定式做目的状语，故选C。