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
Not only ______ polluted, but ______ crowded.
A．was the city, were the streets
B．the city was, the streets were
C．was the city, the streets were
D．the city was, the streets were
单项选择题
The room ______ often cleaned by the students.
A．will be
B．has
C．is
D．was
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