第一， 情景对话

A: What's happened? Why are the students kicking up such a row?

发生什么事了？学生们怎么大吵大闹的。

B: It is because of one of those things that keep happening these days.

因为近些天发生了一件事。

A: What is it?

什么事？

B: The school authorities asked them to sell some products and forced them to finish their quotas. And most of the students find it hard to sell.

学校让他们卖东西，还让他们定额完成任务，大多数学生发觉很难卖。

A: That is indeed a problem. Their parents should join them and raise their opposition against such an unfair task imposed on the students.

这确实是个问题，他们的父母也应该一起来抵制这种加在学生身上的任务。

第二，文法解析

1. It is because of one of those things that keep happening these days.

解析1：keep happening的意思是“不断发生”。表示不断发生某事，可用keep，后面的动词用v+ing形式。

解析2：that happening these days式限定性定语从句，修饰先行词things。“those things that keep happening these days”的意思是“这些天来不断发生的这些事情”。

2. And most of the students find it hard to sell.

解析：find it hard to sell中的hard是做find后的宾语It的补足语，to sell是动词不定式，做形容词hard的补足语。

3. Their parents should join them and raise their opposition against such an unfair task imposed on the students.

解析：imposed on the students是过去分词短语做定语，修饰task。“task imposed on the students”的意思是“强加于学生身上的任务”。