单项选择题

The relationship between employers and employees has been studied______.

A．originally
B．extremely
C．violently
D．intensively
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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
单项选择题
On New Year's Eve, New York City holds an outdoor______ which attracts a crowd of a million or more people.
A．incident
B．event
C．case
D．affair
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