问题
选择题
When he was a child, he _______ swim in this river. [ ]
A. uses to
B. doesn't use to
C. used to
D. was used to
答案
答案：C
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When he was a child, he _______ swim in this river. [ ]
A. uses to
B. doesn't use to
C. used to
D. was used to
答案：C