keeping pets ______ (bring) old people a lot of happiness用所给词的适当形式填空

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keeping pets ______ (bring) old people a lot of happiness用所给词的适当形式填空

keeping pets ______ (bring) old people a lot of happiness用所给词的适当形式填空
keeping pets ______ (bring) old people a lot of happiness
用所给词的适当形式填空

keeping pets ______ (bring) old people a lot of happiness用所给词的适当形式填空
brings 动词ing作主语 谓语动词用单数

brings 动名词做主语 动词形式用单三

brought