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  3. "I saw Mary in the library yesterday.""You ______ her, she is still in hospital."

"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、mustn’t have seen
B、could not see
C、can’t have seen
D、must not see
答案C
解析 情态动词must作为推测时，不能用于否定式，它的否定式是can’t，故排除选项A、D 虽然问句用了过去式，但回答时强调的是结果，故选择完成式。
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