题目内容
6．-I saw Helen in the library this morning．-No，it _________ her．She moved to France last week．（ ）
| A． | can't be | B． | can be | C． | mustn't be |
分析 句意：--今天早晨我在图书馆看到海伦了．
--不，不可能．她上周去了法国了．
解答 答案：A．can't不可能；can可能；mustn't禁止．根据She moved to France last week，可知她上周去了法国，不可能在图书馆看到她．表示不可能用can't．故选A．
点评 本题考查情态动词的用法．解答时注意题意以及选项的意思，根据语境作出正确选择．
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