who can save me?帮我解一下这道题If you—— be in time for the early bus ,be sure to get up before five o’clock in the morning.A.are to B.are about to C.are going to D.are due to答案是A为什

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who can save me?帮我解一下这道题If you—— be in time for the early bus ,be sure to get up before five o’clock in the morning.A.are to B.are about to C.are going to D.are due to答案是A为什
who can save me?帮我解一下这道题
If you—— be in time for the early bus ,be sure to get up before five o’clock in the
morning.
A.are to B.are about to C.are going to D.are due to
答案是A为什么C不行,D又是什么意思?

who can save me?帮我解一下这道题If you—— be in time for the early bus ,be sure to get up before five o’clock in the morning.A.are to B.are about to C.are going to D.are due to答案是A为什
答案A A be to do sth将做某事
B be about to do sth即将做某事;打算做某事.这个短语有时与be to do sth可以互换,但是它的意愿性没有be to do sth那么明显.
C be to do sth表示表示按计划或安排要做的事;或者表示“必须”“应该”“打算”做某事.意愿性比较明显.
D be due to sth.由于某事
句意:如果你想赶上早班车,那就必须在五点钟以前起床.
根据句意,是计划、打算做某事.
来源:http://zhidao.baidu.com/question/513854788.html?fr=fd.
虽然又不一样,但是意思相同差不多.