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1 it is strange that some of the passengers _____the plane c

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1 it is strange that some of the passengers _____the plane crash.
A survived B will survive c should survive D would have survived
2.somebody has painted a strange sign on the wall.what on earth____this mean?
A.could B.can C.may D.might
请向我解释下选择的理由?
1 it is strange that some of the passengers _____the plane c
1.c should 竟然 ,表示惊讶
2.b can 用于疑问句中表示怀疑,不相信的态度.may 用在问句中只表示请求对方许可,表示推测时,用在肯定或否定句中