Mr. Mage is always（ ）on appearing his views these years.

Mr. Mage is always（ ）on appearing his views these years.
A、anxious
B、enthusiastic
C、keen
D、thirsty
【正确答案】：C
【题目解析】：A. anxious：be anxious about：对...焦急；B. enthusiastic：be enthusiastic about：对...感兴趣；C. keen：be keen on：对...热心，喜爱，渴望；D. thirsty：thirsty for：渴望...的，根据题目中的介词on，选C。句意：麦基先生这几年都是如此热衷于抛洒他的观点。