单项选择题

A scientist will come to give us a talk ______ computer.

A． at
B． on
C． of
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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
单项选择题
Yesterday I went to town to visit a friend of ______.
A． me
B． my
C． mine
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