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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
考查情態(tài)動詞：第一空填can，can用于疑問和否定句表示推測，第二空can‘t表示推測，表示不可能，句意是：那可能是什么呢？不可能是一個人，因為他沒有動。一定是個垃圾箱。選B。
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