The exhibition is/was held twice every year?哪个对?
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The exhibition is/was held twice every year?哪个对?
The exhibition is/was held twice every year?哪个对?
The exhibition is/was held twice every year?哪个对?
都对...
was是过去...
is是现在
都对,看情况
The exhibition is held twice every year.表客观事实