题目内容

【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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