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。
