【题目】its mother playing it with is (.)
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【答案】It is playing with its mother.
【解析】
its它的，mother妈妈，is playing正在玩，it它，with和……一起，根据所给的句号，可知句子是一个陈述句，根据所给词义可以连成句子：它在和它的妈妈玩。故答案为It is playing with its mother.