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Under the regulation, restaurants and ho...

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

A.since B.once C.unless D.until

 

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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