单项选择题

A．air
B．steam
C．smoke
D．dust
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单项选择题
A．was dyingB．would have diedC．diedD．had died
A．was dying
B．would have died
C．died
D．had died
单项选择题
A．butB．andC．orD．though
A．but
B．and
C．or
D．though
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