题目内容：
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：He appreciated ____ the chance to deliver his thes
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(A) having given
(B) to have been given
(C) to have given
(D) having been given