题文
Walter offered us a lift when he was leaving the office, but our work _______, we refused his offer.
| A．not finishing | B．had not been finished |
| C．not having finished | D．not finished |
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Walter offered us a lift when he was leaving the office, but our work _______, we refused his offer.
| A．not finishing | B．had not been finished |
| C．not having finished | D．not finished |
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