单项选择题

The fact that the management is trying to reach agreement ______ five separate unions has led to long negotiations.

A．over
B．upon
C．in
D．with
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单项选择题
Professor Johnson is said ______ some significant advance in his research in the past year.
A．having made
B．making
C．to have made
D．to make
单项选择题
The work in the office was ______ by a constant stream of visitors.
A．confused
B．hampered
C．reverend
D．perplexed
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