（） your father free on sunday?yes.he ( )work at weekends.A is isn't B does doesn't C is doesn't D does isn't (好像有时候问你的不是人,是一个物,可以问do答be动词)求答案可解释
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选C （Is） your father free on sunday?yes.he ( doesn't)work at weekends.
译：你的父亲星期天有空么?是的,他周末不上班.free 是 形容词,用be 动词修饰,your father是单数,所以用is work 是动词,用doesn't
======以下答案可供参考======
供参考答案1:
C.（Is） your father free on sunday? yes.he ( doesn't)work at weekends.
译为“你的父亲星期天有空么？”“是的，他周末不上班。“