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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单项选择题
A．whatB．whichC．thatD．other
A．what
B．which
C．that
D．other
单项选择题
That young man still denies ______ the fire behind the store.
A．to start
B．having started
C．start
D．to have started
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