thirties这题我选B,可是答案是D,为什么?为什么这里形容年龄要把thirty 变thirties?：he wro

thirties这题我选B,可是答案是D,为什么?为什么这里形容年龄要把thirty 变thirties?：he wro He went to Paris in his thirties.为什么用thirties,thirties什么意思, when he was thirties 这句话对吗? He is () his thirties when he was in his thirties,he joined the Party.为什么填join啊 而不 nineteen thirty和nineteen thirties的区别是什么呢? in one's thirties的意思是more than thirty 还是at the age of t appear为什么有时变成过去式形式,she appeared to be in her later thirties 翻译He is in his teens / twenties / thirties /… 1 He began to write poems in his thirties. He began to work in his thirties是什么意思? “in his thirties"是什么意思?