Mary dropped in ____ Mr Smith, but he wasn' t at home, so she went to drop in ____ Mr Smith&#03

题目简介

Mary dropped in ____ Mr Smith, but he wasn' t at home, so she went to drop in ____ Mr Smith&#03

题目详情

Mary dropped in ____ Mr Smith, but he  wasn' t at home, so she went to drop in ____ Mr Smith's office.          
A.on, onB.at, atC.on. atD.at. on
题型:单选题难度:偏易来源:不详

答案

C

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