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
考查情態(tài)動詞。句意為他的哥哥現(xiàn)在不可能在家，因為他剛才在體育館打籃球。can 表示推測時，主要用于否定句和疑問句中。所以選C。
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