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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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

Ann never dreams of ______ for her to be sent abroad very soon.

A．there being a chance
B．there to be a chance
C．there be a chance
D．being a chance

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