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题型：单选题题类：常考题难易度：普通

2016-2017学年陕西西安市七十中八年级上第二次月考英语试卷

I don't know ________.

A、how can I do it B、how to do it C、what can I do D、how to do

举一反三

What can trees do _________ us ?
They can _________ harmful gases and produce oxygen .

The teacher often tells Jim and David _______ too much time _______ computer games.

It's cold outside. You had better _______ your coat.

--l will go to Harbin for nay summer vacation．What about you?

--I haven't decided where ．

Here are some good ways {#blank#}1{#/blank#} (learn) English, you can try them!

We must make computers {#blank#}1{#/blank#} (serve) us better.

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