单项选择题

His revised project is turned __________ again as it lacks solid base to be developed on.

A．down
B．back
C．out
D．away
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单项选择题
The __________of the relief to the flooded area was held up because of the inconvenient road conditions.
A．carriage
B．transportation
C．delivery
D．arrival
单项选择题
His presentations are so __________ that we can't make sense of his real meaning.
A．arbitrary
B．ambiguous
C．straightforward
D．rigorous
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