单项选择题

The head of the museum was ______ and let us actually examine the ancient manuscripts.

A．promising
B．agreeing
C．pleasing
D．obliging
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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
单项选择题
Scientific research results can now be quickly ______ to factory production.
A．used
B．applied
C．tried
D．practiced
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