______(Dog)dog is ______ useful animal.

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______(Dog)dogis______usefulanimal.______(Dog)dogis______usefulanimal.______(Dog)dogis______usefulan

______(Dog)dog is ______ useful animal.
______(Dog)dog is ______ useful animal.

______(Dog)dog is ______ useful animal.
___/___Dog is ___a___ useful animal 考的是冠词

_Sheeperd__(Dog)dog is __an__ useful animal.牧羊犬是一只有用的动物
或 police dog 警犬
或 bull dog 哈巴狗

A an

这个问题是什么意思? 句子是要表达什么啊?