()of rice has been eaten already by the end of the day.是much

原题应该是
much of the rice has been eaten already by the end of the day.
楼主少写了 一个the
这样答案绝对是much 不是plenty
这里much 是代词
注意 much of the rice和much rice意思是不一样的
前者 是这些大米中的许多 后者是许多大米