单项选择题

There is ______ old man in the house.

A．an
B．a
C．the
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单项选择题
—Where is my shirt
A．Here you are.
B．It's on the desk.
C．It's yellow.
单项选择题
I ______ my clothes when mother came back last night.
A．was washing
B．washed
C．am washing
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