单项选择题

--Hi, Tracy, you look tired.--I am tired. I ______ the living room all day.

A．painted
B．had painted
C．have been painting
D．have painted
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单项选择题
The population of America is smaller than _____ of our country.
A．those
B．it
C．that
D．this
单项选择题
Had I known her name, ______.
A．or does she know mine
B．I would have invited her to have lunch
C．and where her home
D．she would be at home
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