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题型：单选题 题类： 难易度：普通
上海市青浦区2024年中考二模英语试题
—Frank ____ know it, because he cares best about it.
—Oh，it____be in your bookcase.I saw you put it there last night.
— She ____. The library closes at 9:30 p.m., and everyone has to leave by then.
— No, you needn't. You ____ clean it after school.
— It {#blank#}2{#/blank#} be Mum because I heard her voice just now. （用适当的情态动词填空）
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