题目内容
15．-Whose blouse is this？Is it Sally's？-It be hers．It's too big for her．（ ）
| A． | might | B． | needn't | C． | mustn't | D． | can't |
分析 -这个衬衫是谁的？是萨利的吗？-这个不可能是她的．这个衬衫对她来说太大了．
解答 正确答案：D．四个选项都是情态动词，A是may的过去式，表示"也许、可能"．B是"不必"．C是"不能、不许"．D是"不会、不可能"．根据答语"It is too big for her．"可推测"这个衬衫不可能是萨利的"，且情态动词can后加动词原形，表示对现在情况的推测，常用于否定句和疑问句中．所以正确答案是D．
点评 本题考查情态动词can表示推测的用法，注意can't表示推测常用于否定句和疑问句，如表示对现在情况的肯定推测则只能用情态动词must．
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