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 "What to do 和 I don't know "How to do it"?哪个句子是 i don"t know what to do (next) 和i don"t know how to do (next I don't know what to do i don't know ()to do.填what还是how I really don't know -----with it.A .what to do B.how to do 选 i don't know how to do it句型转换 找错----Sorry,I don't know what to do it 改错：I don't know what to do it. I don’t know what to do.I don’t know how to do.（ × ） 第二句 how I don't know ( ).A.what to do it B.how to do it C.what to do 为什么I don't know what to do成立而I don't know how to do不成立 正常译法是i don't know what to do ,为什么不能用i don't know how to do