–What should parents do when their children have some problems?--I think it’s for them to

问题补充：

–What should parents do when their children have some problems?

--I think it’s for them to be there with their children.

A. impossible

B. important

C. impolite

D. difficult

答案：

A. impossible

(答案→)B. important

C. impolite

D. difficult

解析：根据问句的内容，可知答语的内容，it ‘s important for sb to do sth，可知答案为B