摘要： 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
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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
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
查看习题详情和答案>>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
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