＃416) In the most common procedure for harvesting forage crops such as alfalfa, as much as 20 percent of the leaf and small-stem material, which is the most nutritious of all the parts of the plant, shattered and fell to the ground.
(A) which is the most nutritious of all the parts of the plant, shattered and fell
(B) the most nutritious of all parts of the plant, shatter and fall
(C) the parts of the plant which were most nutritious, will shatter and fall
(D) the most nutritious parts of the plant, shatters and falls
(E) parts of the plant which are the most nutritious, have shattered and fallen
答案是D。 但是“the most nutritious parts of ..." 中用的是 "parts" 为什么谓语还是用单数呢？
the most nutritious parts of the plant是同位语，修饰the leaf and small-stem material 不是句子的主语
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