Many pf stars_____ ,because they are for away from us.

问题描述:

Many pf stars_____ ,because they are for away from us.
A.may not wait
B.can't be seen
C.mustn't be seen
为什么选B?
A.是may not see

不能被我们再看见.必须要用被动语态 所以A排除.mustn't表示禁止,can't表示不可能 所以选B