单项选择题

The snow seems to have set ______ for the evening.

A．upon
B．in
C．about
D．down
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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
单项选择题
Flag Day is a legal holiday only in the state of Pennsylvania, ______ Betsy Ross sewed the first American flag.
A．which
B．where
C．that
D．has
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