单项选择题

A．but
B．and
C．so
D．then
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单项选择题
A．deliveringB．puttingC．pushingD．pulling
A．delivering
B．putting
C．pushing
D．pulling
单项选择题
How long do you think the man stayed in the U. S.
A． Two or three days.
B． About ten hours.
C． At least five days.
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