It was not until 1978_____ set free from the prison.
| A．that the old professor was | B．did the old professor |
| C．was the old professor | D．that was the old professor |
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It was not until 1978_____ set free from the prison.
| A．that the old professor was | B．did the old professor |
| C．was the old professor | D．that was the old professor |
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