—Be quiet, Mr Smith is coming.
—Don’t worry. It ___ be him. Mr Smith is much taller.
A.  mustn’t      B.    must   C.     can’t
C
情態(tài)動(dòng)詞的用法。mustn’t指不允許,表示禁止;must 必須;應(yīng)該,表猜測(cè)時(shí),用于肯定句,意為“一定”,可能性較大;can能,會(huì),表猜測(cè)時(shí),常用于否定句和疑問(wèn)句,意為“不可能”;依據(jù)句意“安靜,史密斯先生來(lái)了!薄安灰獡(dān)心,不可能是他,史密斯先生高得多!保@里表是否定的猜測(cè),故選C。
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