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; to being
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(答案→)A. preferred; to being
B. preferred to; rather than
C. preferred; than being
D. preferred; to being
解析： 考查句型：prefer doing sth to doing sth. 宁愿…..而不….。