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 题目和参考答案——青夏教育精英家教网—

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

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