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If you       be in time for the early bus , be sure to get up before five o’clock in the morning.
A.are toB.are about toC.are going toD.are due to
A

试题分析:考查将来时的表达法。be to do sth表示将来时的时候,表示一种语气,非要做某事,相当于must,be sure to do sth;be about to do sth即将做某事,不与具体的将来时的时间状语连用;be going to do sth表示计划好要做某事,或者根据某种迹象要做某事;be due to do sth表示预定好了要做某事;句意:如果你一定要赶上早班公交车,务必要在5点之前就起床。故A正确。
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