单项选择题

A. They can’t fit into the machine.
B. They have not been delivered yet.
C. They were sent to the wrong address.
D. They were found to be of the wrong type.
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单项选择题
A. Women. B. Prisoners. C. Manualworkers. D. School age children.
A. Women.
B. Prisoners.
C. Manualworkers.
D. School age children.
单项选择题
A. Bad weather. B. Human error. C. Breakdown of the engines. D. Failure of the communications system.
A. Bad weather.
B. Human error.
C. Breakdown of the engines.
D. Failure of the communications system.
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