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He is very busy.I don't know if he will come or not tomorrow.句中will come为什么不用is coming

题目详情
He is very busy.I don't know if he will come or not tomorrow.句中will come为什么不用is coming
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答案和解析
is coming 更多的用在有计划性的行为上,而这里不知来不来,显然不在计划之内.