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英语 高中 · 高一 北师大版 · 必修第一册 单选题 ★★★☆☆ 编号 #10261
She ___ swim very well when she was only six.
A. must
B. can
C. could
D. may
章节：情态动词 · 知识点：情态动词 · 标签：情态动词,语法
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