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
-- Have you ______ Beijing before--Not Yet.
A． gone to
B． been to
C． been in
单项选择题
The trousers ______ too short for me. Please show me some others.
A． is
B． am
C． were
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