单项选择题

Before setting out on a long journey, you must make sure that your car is（）

A．in place
B．in order
C．in practice
D．in theory

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单项选择题

The murderer was brought in, with his hands（）behind his back.

A．being tied
B．having tied
C．to be tied
D．tied

单项选择题

Training astronauts（）not an easy thing.

A．are
B．is
C．were
D．be

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