Mary dropped in Mr Smith, but he wasn' t at home, so she went to drop in Mr Smith's offi

发布时间:2020-08-16 07:58:00

Mary dropped in      Mr Smith, but he  wasn' t at home, so she went to drop in      Mr Smith's office.          
A. on, on
B. at, at
C. on. at
D. at. on

网友回答

A. on, on
B. at, at
(答案→)C. on. at
D. at. on
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