单项选择题

He won the scholarship. He ______ hard these terms.

A．should have worked
B．must have worked
C．must have been working
D．could have worked
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单项选择题
He will be sad when he ______ the bad news.
A．hear
B．is hearing
C．will hear
D．hears
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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