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题型：单选题 题类：常考题 难易度：困难
外研版2017-2018年小学英语五年级下册Module 3 Unit 2 Sam ate four hamburgers 同步练习
—He usually{#blank#}3{#/blank#}his homework. Look! He is{#blank#}4{#/blank#}his homework now. (do)
—I went to the nature park.
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