题目内容
________ 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
B
句意:因为没有得到书面许可,他不得不给大学校长写了另外一封信。此处“没有得到书面许可”发生在“写另外一封信”之前,再结合语意,应用现在分词的完成被动式作状语,分词的否定式是在前面加上not,所以选B项。
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