We saw a dog run up to the bird.（改为被动语态）
We saw a dog run up to the bird.（改为被动语态）
A dog _ _ to run up to the bird
A dog _ _ to run up to the bird
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We saw a dog run up to the bird.（改为被动语态）
A dog (was) (seen) to run up to the bird
A dog (was) (seen) to run up to the bird
1年前
4
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你能帮帮他们吗