Mark Twain became famous in his _.A fifties B fifty C fiftieth D the fiftieth
问题描述：
Mark Twain became famous in his _.A fifties B fifty C fiftieth D the fiftieth
答
in one's +序数词，亲
答
你好:
选C 在某人多少岁时 用 in one's + 序数词
翻译:马克.吐温50岁时成名的.
答
应该是A
in one‘s +数词的复数（一般为十的倍数）表达年龄的大致范围
答
选A
in one's 数字复数。 在某人几岁时