one of the most popular expressions in 2012 _____ "positive

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one of the most popular expressions in 2012 _____ "positive energy".
这是今年淮安的中考题,纠结是选择is还是was,每个人说法都不一样.求教.

应该是was 吧
不知LZ是不是想这句话应该是确定事实,所以就算是2012年的事也要用is?
举两个例子：In the early 1980s "Where's the beef?" 【WAS】 one of the most popular expressions in the United States.
It 【WAS】 one of the most popular expressions in the USA
这些句子都是具体事实,当年确实流行过.但是没有使用is的必要.

The panda is one of the most popular animals in one of the most popular sports in the world one of the most popular ways to travel in japan one of the most popular sports is one of the most popular One of the most popular--------of---------in the world is ch The giant panda is one of the most popular animals in the wo one of the most popular kind of food in （） is fish and chips In England,one of the most popular kinds of food is fish and in Englang,one of the most popular kings of food is fish Pocorn is one of the most popular kind/kinds of foods in cin Paris is one of the most popular attractions in the world.用英