The hero of the story is an arist in his _____.A thirtieth B thirtyC thirty's D thirties

熱心網(wǎng)友

選B 因?yàn)檫@是一個(gè)固定搭配，只要記得in one‘s +歲數(shù)即可而歲數(shù)就是一些序數(shù)詞的運(yùn)用，掌握好了，就OK了

熱心網(wǎng)友

選D,in one's 加上數(shù)字的復(fù)數(shù)形式，是固定用法，表示在某人幾歲的時(shí)候，比如in one's twenties