these stones,each___as much asfour tons,came from the Alps Mountains..A.weighted B.weighs C.to weigh D.weighing选哪个?为什么?
问题描述：
these stones,each___as much asfour tons,came from the Alps Mountains..
A.weighted B.weighs C.to weigh D.weighing
选哪个?为什么?
答
B.weighs
weigh作动词用表示“重……”，因为是each每一个，谓语用单数，要三单
答
D.句子的动词是“came”，所以前面只能用动名词形式，是独立主格结构。
答
D.weighing
这是一道很容易选错的题目.
按汉语的习惯,each做主语,谓语动词理应用单数,即选 B.weighs .但按英语的语法,本句的each却不能做主语,因为前面已经有these stones 做主语；谓语也不是weighs,而是后面的came from.
each weighing as much as four tons,属于独立主格结构,做状语.这样理解才符合英语的语法.
答
d这是独立主格结构啊