单项选择题

The negotiations which______the signing of the treaty took place over a number of years.

A．preceded
B．prescribed
C．proceeded
D．processed
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单项选择题
Trees that______the view of the oncoming traffic should be cut down.
A．block
B．inhibit
C．spoil
D．alter
单项选择题
A considerable amount of time and money has been invested in______this system.
A．defining
B．implying
C．reducing
D．perfecting
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