单项选择题

The auxiliary police ______ to report to headquarters immediately.

A. require
B. requires
C. are required
D. is required
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单项选择题
Electronics ______ quickly in recent years.
A. developed
B. developing
C. has developed
D. have developed
单项选择题
The United Nations ______ formed in 1945.
A. was
B. were
C. are
D. is
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