问题描述：
-Are you good ____ children?_Yes ,I think I can help them ____ swimming.
选项
A.with ,in B.with,with C.at,with D.for，with
选哪个？为什么
选项
A.with ,in B.with,with C.at,with D.for，with
选哪个？为什么
问题解答：
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