问题描述：
关于英语选择提
--Is Pro.Smith giving the speech today
--It____be him .He is abroad right now.
A mustn't B needn't C won't D can't
请问选哪个 并为什么要选它呢?
--Is Pro.Smith giving the speech today
--It____be him .He is abroad right now.
A mustn't B needn't C won't D can't
请问选哪个 并为什么要选它呢?
问题解答：
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