单项选择题

Mr. Smith and Miss Green ______ from America.

A． both are
B． are both
C． all am
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单项选择题
They were invited to an important ball ______ the first time in their life.
A． for
B． at
C． on
单项选择题
______ people went to California to look for gold(金子).
A． Thousand of
B． Thousands of
C． Ten thousands of
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