问题补充：
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
答案：
(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….。
