单项选择题

She was complaining that the doctor was ______ too much for the treatment he was giving her.

A．expending
B．offering
C．costing
D．charging
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单项选择题
The relationship between employers and employees has been studied______.
A．originally
B．extremely
C．violently
D．intensively
单项选择题
That young man still denies______ the fire behind the store.
A．start
B．to start
C．having started
D．to have started
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