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
This car costs ______the other one.
A．as much over
B．as much more as
C．as much to
D．as much as
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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