单项选择题

A．They have been replaced by electric trains.
B．They have been used for special railway service.
C．They have become more comfortable.
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单项选择题
A．To travel abroad.B．To run a special school.C．To give some concerts.
A．To travel abroad.
B．To run a special school.
C．To give some concerts.
单项选择题
A．Have a good evening together.B．Spend the summer vacation together.C．Say goodbye to each other.
A．Have a good evening together.
B．Spend the summer vacation together.
C．Say goodbye to each other.
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