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题型：语法填空（单句） 题类：常考题 难易度：容易
冀教版2018-2019学年初中英语九年级下册Unit 8 Lesson 44 Popular Sayings 同步习题
{#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} keep the classroom clean.
We are busy {#blank#}1{#/blank#} our homework.
—It must ______ Jack. I saw him reading it just now.
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