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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