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题型：单选题 题类：常考题 难易度：容易
牛津上海（本地版）五四制七年级上册Module 2 Unit 7 Signs around us同步练习3
He is busy with his work {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#}.
—_________making phone calls or chatting online?
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