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代词一、考查人称代词1.Helen and Mary are good friends______often help each other(.江苏淮安)A.Them B.Theirs C.They D.Their【解析】前面的Helen and Mary是复数,后面句中的主语应用代词they,故选C。2.Healthy food and exercise help______to study better(.湖南株洲)A.us B.we C.our【解析】help sb(to)do sth意为"