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
A.may not wait
B.can't be seen
C.mustn't be seen
为什么选B?
A.是may not see
问题解答：
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