单项选择题

A．Because he didn’’t feel very well.
B．Because he overslept and missed the lunch.
C．Because he didn’’t hear the lunch bell.
D．Because he thought he couldn’’t afford it.
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单项选择题
The basic principles applied to natural-gas vehicles are quite different from those applied to gasoline-powered vehicles.
A．Y
B．N
C．NG
单项选择题
A．The man used to live in the city.B．The library uses computer systems.C．The woman is ready to help.D．The man is confident of his computer skills.
A．The man used to live in the city.
B．The library uses computer systems.
C．The woman is ready to help.
D．The man is confident of his computer skills.
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