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题型：句型转换 题类：常考题 难易度：容易
外研（新标准）版2017-2018学年九年级英语上册Module 1 Unit 1 It's more than 2,000 years old. 课时练习
to do the experiment first ?
— Once a month.
People {#blank#}1{#/blank#} the paper {#blank#}2{#/blank#} wood.
—_______ a week.
{#blank#}1{#/blank#} {#blank#}2{#/blank#} young people learn how to care for others?
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