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题型：单选题 题类：常考题 难易度：普通
鲁教版（五四制）七年级上册Unit 6 How often do you exercise? Period 3 Section B (1a-2e) 同步练习
—Yes. He needs to buy some books.
Mike wants to be an engineer when he {#blank#}1{#/blank#} {#blank#}2{#/blank#}.
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