改错：I don't know what to do it.

改错：I don't know what to do it. 找错----Sorry,I don't know what to do it I don't know what to do I don't know "What to do 和 I don't know "How to do it"?哪个句子是 I don't know ( ).A.what to do it B.how to do it C.what to do I really don't know -----with it.A .what to do B.how to do 选 I don't know ______.A what to do with it B what to do it wit i don't know how to do it.为何要加It?而what to do 后则不加it? I understand,but,I don't know what to do? I don't know ------it today.1.what to do 2.how to do 3.to do The bus _____start;I don’t know what to do with it.（b） it's too late for school,i don't know---------.A.what to do