my mother didn't,know《C what to do it

my mother didn't,know《C what to do it He didn't know what to do about it 为什么填what 不是有it吗? He didn't know what to do next.He didn't know what he ____ _ li didn't know(what to do)为什么how to do it后要加it,这个却没有? They didn't know _____ to do A who B when C what D where my mother is angry with me,i don't know what to do (同义句) The boy didn't know___.A：what to do it B：what to do C：when t I was scared and didn’t know what to do. He didn"t know what to do the next day he didn't know what to do .反义文句 I don't know ( ).A.what to do it B.how to do it C.what to do i didn't know what should say to my teacher