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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(dòng)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(cè)時(shí)，主要用于否定句和疑問(wèn)句中。所以選C。
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