题目内容：
22. He appreciated ____ the chance to deliver his thesis in the annual symposium on Comparative Literature.
(A) having given
(B) to have been given
(C) to have given
(D) having been given
参考答案：
选择题：22.He appreciated ____ the chance to deliver his t
- 题目分类：郑州工程技术学院-大学英语（2）.
- 题目类型：选择题
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He appreciated ____ the chance to deliver his thesis in the annual symposium on Comparative Literature.
(A) having given
(B) to have been given
(C) to have given
(D) having been given