A lot of ice cream,hamburgers and cola is not healthy 为什么是is

题目

A lot of ice cream,hamburgers and cola is not healthy 为什么是is

答案

把冰淇淋,汉堡包和可乐看成是一个整体,谓语动词用单数,又如：
Two and two is four.
Blue and yellow is green.
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