单项选择题

There has been a ______ lack of communication between the union and the management.

A．regretful
B．regrettable
C．regretting
D．regretted
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单项选择题
His expenditure on holidays and luxuries is rather high in ______ to his income.
A．comparison
B．proportion
C．association
D．calculation
单项选择题
The computer can be programmed to ______ a whole variety of tasks.
A．assign
B．tackle
C．realize
D．solve
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