What's Tom doing?He___(swim)in a river with his brother.

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What's Tom doing?He___(swim)in a river with his brother.
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What's Tom doing?He___(swim)in a river with his brother.
What's Tom doing?He___(swim)in a river with his brother.

What's Tom doing?He___(swim)in a river with his brother.
is swimming9因为doing)

is swimming

is swimming
表示现在进行时,

is swimming

is swimming
问的是Tom“正在”干嘛,所以也要相应地用现在进行时了

is swimming
本题是现在进行时态,现在进行时态的结构为:be+doing