The visiting professor giving lectures to students invited to meetings at times.
A. preferred; to being
B. preferred to; rather than
C. preferred; than being
D. preferred; than to being
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(答案→)A. preferred; to being
B. preferred to; rather than
C. preferred; than being
D. preferred; than to being
解析：考查prefer用法。固定词组prefer doing A to doing B宁愿做A不做B；句意：这位访问教授宁愿给学生上课也不愿意时而不时被邀请来参加会议。根据句意第二空使用动名词的被动形式。故A正确。