单项选择题

-- I saw Mary in the library yesterday.
-- You ()her, she is still in hospital.

A. mustn't have seen
B. could not see
C. can't have seen
D. must not see

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单项选择题
I didn't know the answer, ()

A. neither he did
B. neither did he
C. neither he knew
D. he didn't neither
单项选择题
He talks as if he()everything.

A. knows
B. was known
C. will know
D. knew
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