请教几道语法题,请大家帮忙了,谢谢!

4.Perhaps the most significant postwar trend was the decentralization of cities through the United States, ________ when massive highway-building programs permitted greaster suburban goowth.    fficeffice" />

(A) and accelerated a phenomenon                (    B) a phenomenon that accelerate

答案是B,请问A为什么不对.

64 Lactose, a sugar present in milk , is one of simple sugars used in food preparations for infants.

为什么a sugar 后是present,而不是presents,请问这里present是什么词性?

98 The Hpi, descendants of the prehistoric Anasazi people, are a     Pueblo people who of the south western United States.

请问为什么are后面可以加a,这样用对吗?

102 Derived from the concept of natural law is the theoretical that individuals possess inalienable natural rights , as stated in the United States Declaration of Independence

    请问为什么individuals是复数形式,而动词possess却用了单数形式.

谢谢了!

102 Derived from the concept of natural law is the theoretical that individuals possess inalienable natural rights , as stated in the United States Declaration of Independencefficeffice" />

    请问为什么individuals是复数形式,而动词possess却用了单数形式.    

lol, i was cheated by your question.     i just realized that     possesses --单数形式.         possess ---原形, OR 复数形式 after i read it again.

关于4，同意楼上的观点，

64 Lactose, a sugar present in milk , is one of simple sugars used in food preparations for infants.

为什么a sugar 后是present,而不是presents,请问这里present是什么词性?


首先说present这里是过去分词，定语从句省略结构：a sugar which is present in milk.
其次这道题争议很大，但个人比较同意C错

98 The Hpi, descendants of the prehistoric Anasazi people, are a     Pueblo people who of the south western United States.
请问为什么are后面可以加a,这样用对吗?

不要单纯的看are和a的关系，这里a people是指一个民族，泛指复数，注意在美国的历史中，凡是指Hipi呀什么民族的，都是泛指复数，从前面descendants就可以看出。所以才有are 和 a pueblo people连在一起。
这题我考试现场考到，who干扰项，把单纯的介词of短语混成定语从句。请注意

102 Derived from the concept of natural law is the theoretical that individuals possess inalienable natural rights , as stated in the United States Declaration of Independence

    请问为什么individuals是复数形式,而动词possess却用了单数形式.

individual要么用冠词，要么复数形式，泛指的时候用复数。possess是原形，同意楼上xizzhu的意见

64 Lactose, a sugar present in milk , is one of simple sugars used in food preparations for infants.

这题确实争议很大，大部分人的答案集中在选项A和C。曾经有人做模拟时，语法部分为满分，而且碰见了该题，选的是C，说明“C“为正确答案。

of simple-->of the simplest