what's wrong with you you look unhappy well the work is too

What's wrong with you?You look unhappy。Well,the work is too difficult。I really don't konw______A。how finish it B。how to finish it C。what finish itD。waht to finish it答案：B解析：how to Sth。=what to do中文：你怎么了?你看起来不高兴。哦,这份工作太难了。我确实不知道怎么完成这份工作。