单项选择题

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单项选择题
A. Flat roofs can be used for drying washing. B. The space is needed for cinemas, clubs and churches. C. The space is useful for parking cars. D. It is a cheap way of building.
A. Flat roofs can be used for drying washing.
B. The space is needed for cinemas, clubs and churches.
C. The space is useful for parking cars.
D. It is a cheap way of building.
单项选择题
A. A platform worker. B. The command spot.C. A computer. D. A machine.
A. A platform worker.
B. The command spot.
C. A computer.
D. A machine.
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