Not having given a written permission, he had to write another letter to the president of the university.

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问题 Not having given a written permission, he had to write another letter to the president of the university.

选项 A、Not giving
B、Not having been given
C、Having not given
D、Having not been given

答案B

解析 此处考点有二:①“没有获得书面许可”发生在“继续写信给校长”之前,所以应使用完成时,即He had not been given a written permission;②将上句转换为现在分词作状语时,表示否定的not应放在现在分词之前,所以应为。Not having been given a written permission。
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