HE COMPLAINED ______ THE CHILDREN ______ THE MESS THEY'VE MADE. (OF...
2. He complained ______ the children ______ the mess they've made. (of-about/ about-to/ to-about/
about of )
2. He complained ______ the children ______ the mess they've made. (of-about/ about-to/ to-about/
about of )