（2015•四川凉山）If all of us pull together, there must be something we can do _____.

题型：单选题题类：真题难易度：普通

If all of us pull together, there must be something we can do _____.

A、improve the environment B、to improve the environment C、improving the environment D、improved the environment

举一反三

Which is the faster way {#blank#}1{#/blank#} {#blank#}2{#/blank#} to Tianjin, by plane or by train?

I'll try my best {#blank#}1{#/blank#} yesterday.

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