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题型：单选题 题类：常考题 难易度：普通
牛津译林版2018-2019学年小学英语三年级下册Unit 7 On the farm 同步练习1
— .
A. I started to study English when I was six.
B. I learned to buy things.
C. Yes, I did.
D. When I was four.
— OK. _____________.
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