"I saw Mary in the library yesterday?" "You______her, she is still in hospital. "

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问题 "I saw Mary in the library yesterday?" "You______her, she is still in hospital. "

选项 A、can’t have seen
B、mustn’t have seen
C、could not see
D、must not see

答案A

解析 用来表示否定的推测语气时,can’t的意思是“不可能”,must的否定形式的意思是“一定不要”。
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