题目内容
2．---Look!It be Tom on the playground．---It be him．I saw him enter the classroom just now．（ ）
| A． | must； can't | B． | must； mustn't | C． | can； can't | D． | may； mustn't |
分析 --看！在操场上的那个人一定是汤姆．
--不可能是他．刚才我看见他进教室了．
解答 答案：A．根据Look!It be Tom on the playground，可知这里表示一种肯定的推测，这里的意思是在操场上的那个人一定是汤姆，所以用must；再I saw him enter the classroom just now，可知这里的意思是刚才我看见他进教室了，所以那个人不可能是他，所以用can't．故选A．
点评 本题考查了情态动词的用法．熟知句意以及所给选项的意思是解答本题的关键．
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