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题型：单选题 题类：常考题 难易度：普通
外研版英语九年级上Module 7 Unit 3 Language in use同步练习
点拨：{#blank#}1{#/blank#}意为"除非，如果不"，引导条件状语从句，这是否定的含义，相当于{#blank#}2{#/blank#}。如：
My sister never cries unless she is hungry. ＝{#blank#}3{#/blank#}
—I won't do ________ you tell me the truth.
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