—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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