单项选择题

A．She had moved out of the old address.
B．She ignored it.
C．The library didn’t try to inform her about it.
D．The landlord refused to give the books back to her.
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单项选择题
A．Workers on the platforms and trains were replaced by machines.B．A completely automatic line was added to its network.C．It became the first completely automatic railway in the world.D．Its trains became manual-controlled.
A．Workers on the platforms and trains were replaced by machines.
B．A completely automatic line was added to its network.
C．It became the first completely automatic railway in the world.
D．Its trains became manual-controlled.
填空题
The development of the hydrogen station network would be greatly affected by the process of __________________ of storage technology.
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