when shall we go to the mountain,this afternoon or tomorrow morning?___is OK.I am free.
问题描述：
when shall we go to the mountain,this afternoon or tomorrow morning?___is OK.I am free.
横线处填:both还是either,说明理由
答
填either
both 是都可以,是两个同时可以
either 也是都可以,是其中一个
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