_____a written permission, he had to write another letter to the president of the university.
| A．Not giving | B．Not having been given |
| C．Having not given | D．Having not been given |
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_____a written permission, he had to write another letter to the president of the university.
| A．Not giving | B．Not having been given |
| C．Having not given | D．Having not been given |
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