17．The woman ______ be our English teacher．She has gone to Canada．（　�。�
A．can'tB．needn'tC．mustn't

分析 翻譯：這位女人不可能是我們的英語老師，她已經(jīng)去了加拿大．

解答 從句意推測，是對這位女人的推測，情態(tài)動(dòng)詞表示推測的不可能只能用can't，
故選：A．

點(diǎn)評 can't、needn't、mustn't，主要是語氣上的不同． can't表示的是不能夠；mustn't表示的是不應(yīng)該；needn't表示不必（沒必要）．

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