C-9：cotton on 理解
A:Mary, could you help me with this problem?
A：玛丽，能给我讲讲这道题吗？
B:Sure, Ah, our teacher has explained it in class, hasn't he?
B：当然可以。啊，这道题老师上课不是讲过了吗？
A:Yeah, But I didn't cotton on the what he said.
A:是的。可我没听懂。
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