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

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：南阳师范学院-教育学-大学英语（四）

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