【題目】It ______ be our English teacher,because he is in Shanghai now.

A. can not B. could not

C. isn't able to D. is able to not

【答案】A

【解析】

句意:那不可能是我們的英語老師,因?yàn)樗F(xiàn)在在上海。can not 不可能,有把握的推測;could not可能不,在表示推測時,可能性要小;isn’t able to不能,表示沒有能力做某事.根據(jù)后半句句意“因?yàn)楝F(xiàn)在他在上!笨芍澳强隙ú皇俏覀兊挠⒄Z教師”,故表示有把握的推測,排除C、D兩項(xiàng);故選A項(xiàng)。

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