— 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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