Question

SAT OG test7的一道语法题

The information age has ushered children into a global society, this situation causing educators to lament a lack of texts that explain the diversity of cultures.
(A) this situation causing educators to lament
(D) a situation causing educators to lament
为什么选D不选A？this指代挺清楚的啊。请详细解释，谢谢

Answer 1

"a situation" 是对前面的" a global society"进行解释，是同位语，所以用"this situation"特指是不对的，后者是起代替作用的。而"causing educators..."是situation的定语。
如果分成两个简单句：The information age has ushered children into a global society. This is a situation causing educators to lament a lack of texts that explain the diversity of cultures.
如果用从句：The information age has ushered children into a global society, which is a situation causing educators to lament a lack of texts that explain the diversity of cultures.
从以上两句可以容易看出为什么不能用”this situation"。如果要用"this situation"，恐怕就要这样表达了：The information age has ushered children into a global society and this situation has caused educators to lament a lack of texts that explain the diversity of cultures.

Answer 2

最简单的方法来理解这道题是，因为后面的短语是修饰作用的，在短语前加一个which is，把短语变从句 。
The information age has ushered children into a global society, which is this situation causing educators to lament a lack of texts that explain the diversity of cultures.
The information age has ushered children into a global society, which is a situation causing educators to lament a lack of texts that explain the diversity of cultures.
另举个例子。
正确：That is my friend, a student reacher her twenties.
That is my friend, this student reaching her twenties.是不是就感觉有点怪了呢？
前面加who is也能判断出来。
That is my friend, who is a student reacher her twenties.
That is my friend, who is this student reaching her twenties. 这回应该很明显了吧

Answer 3

this =（上述）这种情况
a = 一种 ，不定指, 因此不合适