准确答案为：isishave
解释：a mass of 和 masses of后面既可以加可数名词,也可以加不可数名词.此类短语做句子主语时,谓语动词的数跟of后面的名词的数保持一致,即就近原则.
第一二题of后面的water/ice是不可数名词,所以谓语动词都用单数形式is；而第3题of后面的people是可数名词复数,所以谓语动词用复数形式have.
适当形式填空.A mass of water_____(be)flowing out of the room.Masse
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