Question

【题目】Carl Marx began to learn Russian .

A.in his fiftyB.in his fiftiesC.in the fiftiesD.in the fifty

Answer 1

【答案】B

【解析】

句意：Carl Marx 在他五十多岁的时候学习俄语。

in one’s +年龄的复数，表示某人多大的时候，in his fifties在他五十多岁的时候。根据题意，故选B。