单项选择题

A．By plane．
B．By bus．
C．By car．
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单项选择题
A．When an air-hostess says so.B．When the seat-belt sign goes off.C．When the captain makes another announcement.
A．When an air-hostess says so.
B．When the seat-belt sign goes off.
C．When the captain makes another announcement.
填空题
∧ two→for
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