单项选择题

A．associated
B．linked
C．united
D．combined
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单项选择题
A．isolatedB．segregatedC．idealizedD．secluded
A．isolated
B．segregated
C．idealized
D．secluded
单项选择题
The student could not have been dead if ______.
A．he had got enough training on the real tracks
B．he had not worked the night shift
C．he had been careful
D．he had been working with someone else
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