Some sorts of fruit are sold by____weight .Eggs are sold by___dozen.A./;/ B.the;/ C./;the D.the ; the选哪个,为什么?

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Some sorts of fruit are sold by____weight .Eggs are sold by___dozen.
A./;/ B.the;/ C./;the D.the ; the
选哪个,为什么?

C,weight、length这种抽象名词不加冠词,dozen这种表示单位的名词加冠词

B By加计量单位时,中间不用the,weight为非计量单位,所以要用the

A. by weight, by dozen 按重量卖,按打卖
前面都不加冠词