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【参考答案】

was→Was。
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单项选择题
A．Generator malfunction.B．Computer error.C．A collision with another station.D．All the above.
A．Generator malfunction.
B．Computer error.
C．A collision with another station.
D．All the above.
单项选择题
A．Now, there are no wars and people live in a peaceful world.B．More children can live to their adulthood and have their own children.C．People live longer now than in the past.D．People immunize many fatal diseases of which many people died.
A．Now, there are no wars and people live in a peaceful world.
B．More children can live to their adulthood and have their own children.
C．People live longer now than in the past.
D．People immunize many fatal diseases of which many people died.
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