单项选择题

That young man has made so much noise that he ______ not have been allowed attend the concert.

A．could
B．must
C．would
D．should
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单项选择题
______ you are free, why not go skating with us
A．Because
B．Since
C．As
D．For
单项选择题
I don't know what illness he suffered from, but I do remember he mentioned ______ in hospital last year.
A．to have been
B．to be
C．having been
D．being
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