单项选择题

Why ______ you come a little earlier

A． do
B． not
C． don't
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单项选择题
Mr. Smith and Miss Green ______ from America.
A． both are
B． are both
C． all am
单项选择题
They were invited to an important ball ______ the first time in their life.
A． for
B． at
C． on
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