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题型:单选题 题类:真题 难易度:容易
—Sure! It's polite to do that. It means you like the food very much.
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#}
—All right, it rains.
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