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
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
单项选择题
They ______ so tired if they ______ for a whole day.
A．wouldn't feel ... didn't walk
B．wouldn't feel ... weren't walking
C．wouldn't be feeling ... weren't walking
D．wouldn't be feeling ... hadn't been walking
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