单项选择题

The experiment requires more money than ______.

A．have been put in
B．being put in
C．has been put in
D．to be put in
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单项选择题
Scientific research results can now be quickly ______ to factory production.
A．used
B．applied
C．tried
D．practiced
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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