单项选择题

They failed to pass the exam last time, I regretted ______.

A．to be not able to help
B．being unable to help
C．being not able to help
D．not be able to help
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单项选择题
He thought the painting was of little ______, so he let me have it for only ten dollars.
A．price
B．cost
C．value
D．expenses
单项选择题
The man, ______ is parked in front of our house, is a famous artist.
A．the red car of which
B．who's red car
C．of whom the red car
D．whose red car
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