题目内容

Her brother        be at home now, because he was seen playing basketball in the stadium just now.      
A．mustn’tB．needn’tC．can’tD．shouldn’t
C
考查情态动词。句意为他的哥哥现在不可能在家，因为他刚才在体育馆打篮球。can 表示推测时，主要用于否定句和疑问句中。所以选C。
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