单项选择题

The United States of America ______ one of the most developed countries in the world．

A．is
B．are
C．was
D．were
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单项选择题
（）fathers couldn't come to the school, because they have gone to Changsha.

A. Li Ping and Wang Hua
B. Li Ping's and Wang Hua
C. Li Ping and Wang Hua's
D. Li Ping's and Wang Hua's
单项选择题
Sorry, we already have four people in the car, so there ______ for this box.
A. is a little room
B. are no rooms
C. is little room
D. are few rooms
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