单项选择题

We are convinced that we are on the _______ of an important discovery.

A．threshold
B．household
C．thread
D．entrance
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单项选择题
His career _______ in his appointment as director.
A．contaminated
B．culminated
C．contracted
D．contacted
单项选择题
The continuous unrest was _______ the nation's economy.
A．exaggerating
B．aggravating
C．amending
D．fastening
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