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题型：单词拼写（单句） 题类：常考题 难易度：普通
新目标（Go for it）版初中英语八年级上册Unit 2 How often do you exercise 第2课时
Johnny had to continue working at night, so he drank coffee to stay wake.
—Open your windows to let {#blank#}1{#/blank#} air in three times a day for at least 15 minutes.
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