单项选择题

She was still a little girl ______ I first saw her.

A． when
B． as
C． while
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单项选择题
A scientist will come to give us a talk ______ computer.
A． at
B． on
C． of
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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