Mr Wang is a famous singer, but his son interested in singing. ( )A.isn'tB.isC.don't

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【题目】Mr Wang is a famous singer, but his son ________ interested in singing. ( )

A.isn'tB.isC.don't

【答案】A

【解析】

句意为王先生是个有名的歌手，但他的儿子对唱歌不感兴趣，主语his son为单数第三人称，系动词应用be的单三形式is，由连词but可知，此处应用is的否定式isn't，故选A。