–Mary, could you tell me if your mother _____ our school sports meeting tomorrow?
--I think she will come to school if she _____ free.

A．will take part in, will be	B．takes part in, is`
C．will take part in, is	D．takes part in, will be

科目 英语   题型 单选题   难度 较易

知识点： 时态辨析