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题型：单选题 题类：常考题 难易度：普通
浙江省人教版（PEP）小学英语六年级上册Unit 4 I have a pen pal（含小段音频）
—Many books and pens.
—No, they {#blank#}2{#/blank#}(are, aren't). They're {#blank#}3{#/blank#}(in, on) the door.
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