单项选择题

Betty ______ morning exercises yesterday.

A． not did
B． don't do
C． didn't do
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单项选择题
Most of the desks and chairs in our school ______ wood.
A． are made of
B． are made in
C． are made by
单项选择题
______ has travelled farther than the moon.
A． Everybody
B． Nobody
C． No body
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