题目内容：

这些是啥用法,过去分词做状语和现在分词做状语有何区别啊啊啊.
1____ about the student,the teacher called his parents to find out why he was so absent-minded in class.
[ A ]
A.Concerned
B.Concerns
C.Concerning
D.Concern
2（Basing ）an important decision more on emotion than one reason,you will regret it sooner or later.
3.
With our knowledge ________ practice,we can make contributions to our society.
[ C ]
A．to base on
B．basing on
C．based on
D．base on
4.All flights （having been canceled） because of the snowstorm,we decided to take the train
5.（Designed） very cleverly to fit into corners,the shelf doesn't take up much room.
6.The boy doesn't work hard enough at his lesson.As for his intelligence,he has _more than__ he can possibly make use of.（此句求翻译……）

优质解答

be concerned about 是一个短语主语是人,故第一个选A.sb base sth on sth ,所以第二个选有主动意味的basing.第三个题中知识应该是被基于练习当中,也就是说knowledge与base是被动关系的.第四题having done 放句首表示...