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【题目】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:那不可能是我们的英语老师,因为他现在在上海。can not 不可能,有把握的推测;could not可能不,在表示推测时,可能性要小;isn’t able to不能,表示没有能力做某事.根据后半句句意“因为现在他在上海”可知“那肯定不是我们的英语教师”,故表示有把握的推测,排除C、D两项;故选A项。

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