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6.There is someone knocking at the door,who _____ it be?

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6.There is someone knocking at the door,who _____ it be?
A.can
B.may
C.must
D.need
6.There is someone knocking at the door,who _____ it be?
B may
首先 ,C must 必须,和D 需要 可以排除,意思都不对.
A,can 能,表面意思好像对,“能是谁呢?”但是CAN表示“能”的时候是解作“有能力做” I can do it 我能做（表示我有能力做）,所以代入这里的空格,意思不对.
B May ,意思“会,能”,表示可能性或当时情况允许.添入这里空格就对了.
至于如何区分 may 和 can,这里有个小笑话可以给你参考.
有个中国人在美国开车,一天,他在一个分叉口,他不知道这个分叉口能不能向左转,所以就问一个交 警；“can I turn left?”那个交 警就回答：“If you can,you may.”（如果你有能力转,你就可以（允许）转了.）
6.There is someone knocking at the door,who _____ it be? ---someone is knocking at the door.Who _____ it be? someone is knocking at the door.who [ ]it be? Someone is knocking at the door.Who it be?— It be Tom.He is 1.— There’s someone knocking at the door.Who could _____ be? Someone is knocking at the door,but who can____ be? --Listen! Someone is knocking at the door. Who _____it be? ---Listen! Someone is knocking at the door. Who _____it be? Someone is knocking at the door.Who can it be?的回答.A.Nothing -----Someone is knocking at the door.It ____ be Tom . There is someone knocking at the door.It may ________ (be) t someone is knocking at the door,who is it? A this is a polic