Although many people are ______ on going abroad, he prefers to s

Although many people are ______ on going abroad, he prefers to stay in his own country.
A、keen
B、crazy
C、mad
D、eager
【正确答案】：A
【题目解析】：keen 敏锐的 渴望的；crazy 疯狂的；mad 生气的； eager 渴望的；句意：虽然许多人热衷于出国，但他宁愿留在自己的国家。be keen on 固定搭配，渴望做某事