单项选择题

The United Nations ______ formed in 1945.

A. was
B. were
C. are
D. is
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单项选择题
The barrier was used ______ protection which kept the enemy out of frontier towns.
A. as means of
B. as mean of
C. as a means of
D. as a mean of
单项选择题
We do not do much ______ with him.
A. commerce
B. businesses
C. business
D. enterprise
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