单项选择题


A．how to make fire
B．why to make fire
C．what to do
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单项选择题
A．lost their livesB．lost their lifesC．lose their lives
A．lost their lives
B．lost their lifes
C．lose their lives
单项选择题
A．andB．butC．or
A．and
B．but
C．or
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