单项选择题

On closer ______ , the notes proved to be false.

A．observation
B．investigation
C．inspection
D．examination
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If we ______ our relations with that country, we'll have to find another supplier of the raw materials.
A．diffuse
B．diminish
C．terminate
D．preclude
单项选择题
The special workshop was ______ over by a famous scientist.
A．presided
B．administered
C．mastered
D．executed
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