单项选择题

In _________ between commercial parties, the constraints are usually non-existent or vague.

A．transactions
B．transmissions
C．transitions
D．transformations
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单项选择题
This research conducted by these six scientists is in _________ with Yale University.
A．conjunction
B．connection
C．collaboration
D．combination
单项选择题
In addition, the opposition will be allowed to publish a daily newspaper with a _________ of 500,000.
A．manipulation
B．reproduction
C．circulation
D．penetration
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