【題目】Restaurants must stop offering free plastic bags in Beijing _______ customers ask for them.

A.sinceB.unlessC.because

【答案】B

【解析】

句意：北京的餐廳必須停止提供免費(fèi)塑料袋，除非顧客要求。

考查連詞辨析。since自從；unless除非；because因?yàn)�。根�?jù)Restaurants must stop offering free plastic bags in Beijing及customers ask for them，可知，除非顧客主動(dòng)要，否則北京的餐廳不可以提供免費(fèi)塑料袋，后文表?xiàng)l件，所以空格處填引導(dǎo)條件狀語(yǔ)從句的連詞unless。故選B。

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