问题补充:
— When did you start to collect stamps?
— I got my stamp when I was years old.
A. one, seven
B. one, seventh
C. first, seventh
D. first, seven
答案:
A. one, seven
B. one, seventh
C. first, seventh
(答案→)D. first, seven
解析:句意:-你什么时候开始收集邮票的?-我在7岁的时候得到了我的第一张邮票。由句意可知,7岁的时候,应该是when I was 7 years old,应用基数词。而第一空是说得到了第一张邮票,故应用序数词。故选D。