more than one example is necessary to...为什么用is而不用are?

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more than one example is necessary to...为什么用is而不用are?

more than one example is necessary to...为什么用is而不用are?
more than one example is necessary to...为什么用is而不用are?

more than one example is necessary to...为什么用is而不用are?
主语是morethanoneexample

example是单数,就用is