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--- What        it be?
--- It         be a man, for it is not moving. It      be a dustbin, I think.
A.can, may, mustB.can, can’t, must
C.can, must, canD.may, may not, could
B
考查情态动词:第一空填can,can用于疑问和否定句表示推测,第二空can‘t表示推测,表示不可能,句意是:那可能是什么呢?不可能是一个人,因为他没有动。一定是个垃圾箱。选B。
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