问题补充:
---How was your weekend?
---Great! It was my grandfather’s birthday. We enjoyed ourselves.
A. seventy
B. seventieth
C. the seventieth
D. seventeenth[
答案:
A. seventy
(答案→)B. seventieth
C. the seventieth
D. seventeenth[
解析:句意:--你的周末过得怎样?--很好,那是我祖父七十岁的生日,我们玩得很高兴。这里指的是祖父的第七十个生日,应该用序数词,当序数词前有形容词性物主代词时,序数词前就不能再用定冠词。根据句意故选B。