单项选择题

The company used so much coal that it has a train to _______ the delivery process.

A．transmit
B．transport
C．facilitate
D．diminish
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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
单项选择题
His career _______ in his appointment as director.
A．contaminated
B．culminated
C．contracted
D．contacted
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