单项选择题

Macao returned to our motherland ______ December 20th 1999.

A． on
B． at
C． in
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单项选择题
Nothing but grass and trees ______ the hill.
A． covers
B． cover
C． covering
单项选择题
Lily was very angry ______ Tom for not asking her to the party.
A． with
B． to
C． about
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