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(2006·全国Ⅰ)

There is no light on---they ________ be at home.

[  ]

A.can't
B.mustn't
C.needn't
D.shouldn't

答案:A
解析:

此题考查情态动词的用法。句意" (家中) 没有亮灯----他们肯定不在家"。此处要用情态动词表推测,且用于否定句表示"肯定不……",故can't符合要求;must表推测时不用于否定句,mustn't表示"禁止,不许"needn't"不需要" shouldn't"不应当",故A项将合要求。


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