—Cathy， did you attend the lecture given by Mr． Black last night？
—No． I ______ a report at the office．
| A．was writing | B．wrote |
| C．had written | D．have been writing |
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—Cathy， did you attend the lecture given by Mr． Black last night？
—No． I ______ a report at the office．
| A．was writing | B．wrote |
| C．had written | D．have been writing |
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