单项选择题

It's a shame ______ able to give them any advice.

A．not to have been
B．to have not been
C．to have been not
D．to not have been
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单项选择题
The snow seems to have set ______ for the evening.
A．upon
B．in
C．about
D．down
单项选择题
______ allowing for his age, he still acts very immaturely.
A．But
B．Yet
C．Although
D．Even
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