单项选择题

One of our neighboring countries has contracted an ______with another country.

[A] alliance
[B] combination
[C] collaboration
[D] partnership
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单项选择题
They discussed the matter from all conceivable
[A] angels
[B] angles
[C] annuals
[D] annals
单项选择题
The urban ambient quality in some cities was improved ______a certain extent.
[A] by
[B] with
[C] to
[D] of
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