请问I don't know what to do next.中的what to do next是宾语从句吗?为什么?

请问I don't know what to do next.中的what to do next是宾语从句吗?为什么? I don't know what to do next 改成宾语从句 I don't know what to do next.改为宾语从句 I don't know what to do中what to do是宾语从句吗? i don't know how to do next还是what to do next I really don't know ( ).A.what to do the next B.what to do i i don"t know what to do (next) 和i don"t know how to do (next I don't know what to do next,这句话哪里错了,为什么啊 “I don't what to do.”中的what to do充当什么成分,是宾语从句吗? we don't know( )next A:hom to do B:what to do选什么 为什么 i don't know how to do next还是what to 英语宾语从句问题,I don't know what to do with the problem.为什么用what?我