Listen,the bird_____(singing,is singing)in the tree.选词填空

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Listen,the bird_____(singing,is singing)in the tree.选词填空
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Listen,the bird_____(singing,is singing)in the tree.选词填空
Listen,the bird_____(singing,is singing)in the tree.
选词填空

Listen,the bird_____(singing,is singing)in the tree.选词填空
is singing
be +doing 是进行时态的结构形式.