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?yàn)樗麆偛旁隗w育館打籃球。can 表示推測時(shí),主要用于否定句和疑問句中。所以選C。
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