621] The visiting professor giving lectures to students invited to meetings at times. [译文] 来访教授宁愿作讲座而不愿不时地被邀请参加会议. A. preferred; to being B. preferred to; rather than C. preferred; than being D. preferred; to being [答案及简析] A. 考查句型:prefer doing sth to doing sth. 宁愿-..而不-.. 【
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