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
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单项选择题
Readers are invited to _________ their opinions on any of the issues discussed here.
A．dedicate
B．contribute
C．attribute
D．distribute
单项选择题
He _________ the government's rule against taking large amounts of cash out of the country.
A．defied
B．refuted
C．excluded
D．vetoed
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