GWD14-30,32(已查过前人帖）

Q30:

The ancient Anasazi harvested such native desert vegetation as the purple-flowered bee plant, what they now commonly call wild spinach in northern Arizona and other parts of the southwestern United States.

1. what they now commonly call
2. a plant that they now commonly call
3. now commonly called
4. and is mow commonly called
5. which it is now commonly called

Answer is C

Why not A or B?

1. have to know a great deal more than now about the social and economic
2. have to know a great deal more than they do now about the social and economical
3. would have to know a great deal more than they do now about the social and economical
4. would have to know a great deal more than they do now about the social and economic
5. would have to know a great deal more than now about the social and economic

Answer is D

哪位nn讲解一下为什么要用would have to

哪里看出是构造假设啊?

more accurate 与句子后半段的now暗示其实现在的人做得还不够，也就是说“他们本应该做的更好”

考到了一点句子的逻辑关系了