The old man began to learn to drive a car at the age of —— a.sixty b.the sixtieth c.sixties
问题描述:
The old man began to learn to drive a car at the age of —— a.sixty b.the sixtieth c.sixties
答
选a,因为只有a是表示年龄的,b是序数词,c是英语中的复数形式