By this time of next Friday,I——to New York by the Korean Air

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By this time of next Friday,I——to New York by the Korean Airline
A.will fly B.will be flying C.am flying D.will have flow
答案为什么选B而不是D?为什么是将来进行时不是将来完成时?什么情况下用将来完成时,什么情况有将来进行时?怎么判断?

这个句子的意思是：
下个礼拜五的这个时候,我将会坐上飞往纽约的韩国航空了.
那么这个时间是持续的,这个时间是在飞的,强调持续（这个时间段）,所以是将来进行时
完成时态是来某一时间以前已经完成的动作
再问：您好，请问一下。
by this time of next Friday 不是”在下个星期五的这个时候之前“吗？这应该用完成时态啊？
再答：不是的， by this time of next Friday 是到下星期五的这个时候，不是完成时态
by this time 到现在，不是在……之前
再问：已采纳，十分感谢！

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