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    【题目】Under the regulation, restaurants and hotels shall stop offering throwaway items_______customers request them.

    A.sinceB.onceC.unlessD.until

    【答案】C

    【解析】

    考查状语从句的连接词。句意：根据规定，餐馆和酒店应停止提供一次性物品，除非顾客要求。since作为连词，表示“自从”，引导时间状语从句，表示“因为”，引导原因状语从句； once 用作连词，既可以表示“条件”（= if, as long as），也可以表示“时间”（=as soon as）； unless意为“除非，如果不”，常用来引导条件状语从句；until作为连词，意为“直到......”引导时间状语从句。分析句子可知，如果顾客不要求的话，根据规定，餐馆和酒店应停止提供一次性物品。状语从句表示条件，结合选项看，选项C符合题意。故选C项。

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