school clean up

school clean up school clean-up school-clean-up是什么意思 take/have school clean-up It takes them ()several hours clean up the school. students,should,and,keep,clean,up,the,it,school,yard,clean clean up clean out辨析 clean up与clean out clean up clean out clean down clean it up 还是 clean up it clean-up和clean up的区别 each ——should clean up a bit of the school yard.students/stu