Restaurants must stop offering free plastic bags in Beijing _______ customers ask for them.
- A.since
- B.unless
- C.because
正确答案及解析
正确答案
解析
句意：北京的餐厅必须停止提供免费塑料袋，除非顾客要求。
考查连词辨析。since自从；unless除非；because因为。根据Restaurants must stop offering free plastic bags in Beijing及customers ask for them，可知，除非顾客主动要，否则北京的餐厅不可以提供免费塑料袋，后文表条件，所以空格处填引导条件状语从句的连词unless。故选B。
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