2. 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

2.
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

出自：郑州工程技术学院-大学英语（2）.

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