题目内容
15．-Are those Helen's glasses？-They _______ be Helen's．I've never seen her wear glasses．（ ）
| A． | must | B． | mustn't | C． | can | D． | can't |
分析 -那些是海伦的眼镜吗？
-一定不是海伦的．我从没看到她戴眼镜．
解答 答案：D．
本题根据语境可推知句意为：那些是海伦的眼镜吗？一定不是海伦的．我从没看到她戴眼镜．表示推测时"一定不是"应用"can't"．must一定，必须；mustn't禁止；can能，会；故选D．
点评 本题考查了情态动词的用法．解答时注意理解句意以及所给选项的意思并作出正确选择．
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