分类：教育/科学-外语学习-英语考试
问题：5.Educationistsconsiderit_____ch? 
5. ucationists consider it _____ children doing homework all day long on weekends.A.  improper to haveB.  improper havingA与B有什么区别？
回答：选A
consider it +adj.+ to do    认为做．．．　
consider +doing   考虑做某事