Please make sure that dinner is ready by 6 o'clock,by which

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Please make sure that dinner is ready by 6 o'clock,by which time all the guest_______.
为什么用will have arrived 而不用 will be arriving?

will be arriving是将来进行时.
will have arrived是将来完成时.
首先,这句话的意思是说6点的时候所有宾客都来了,所以晚饭要在6点准备好.这是将来的时间点要用将来时.
其次,根据句中by,可以知道是在某个时间点之前已经发生了某个动作,应该用完成时.根据句意,也应该是6点,宾客已经到了,而不是正在到达,所以用will have arrived

Please make sure that dinner is ready by 6 o'clock,by which Saraah,dinner is ready,please【 by ten o'clock By nine o’clock, Please remember to （) by five o'clock tomorrow morning. It is desirable that you should be there by two o'clock.在这里, by 6 o'clock.each of them live by. They _________ ready for the experiment by eight o'clock yes by ten o'clock意思 It is five o'clock by the blue watch. 27.It is necessary that everything ____ ready by 6:00 p.m. you,make,get,before,o'clock,sure,that,must,there,ten（连词成句）