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
He gives people the impression ______ all his life abroad.
A．of having spent
B．to have spent
C．of being spent
D．to spend
单项选择题
The last half of the nineteenth century ______ the steady improvement in the means of travel.
A．has witnessed
B．was witnessed
C．witnessed
D．is witnessed
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