单项选择题

Who is the man ______ by the window

A．stands
B．stand
C．standing
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单项选择题
The story happened ______ the night of Oct. 20,1939.
A．at
B．for
C．on
单项选择题
-- You haven't lost your key, have you-- ______.
A．I hope so
B．I think not
C．I hope not
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