单项选择题

-- Have you ______ Beijing before--Not Yet.

A． gone to
B． been to
C． been in
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单项选择题
The trousers ______ too short for me. Please show me some others.
A． is
B． am
C． were
单项选择题
The story happened ______ the night of Oct. 20,1939.
A． at
B． for
C． on
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