摘要： C.这是一个省略的强调结构句子.完整的句子是It was in the supermarket we went shopping last Sunday that I met the famous actress. 因此空格处应填一个定语从句的关系词.由于先行词supermarket在定语从句中作了地点状语.故选用关系副词where引导定语从句.

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