— I don’t know to deal with this problem.— Why not ask your teacher for help.A. what B.

问题补充：

— I don’t know to deal with this problem.

— Why not ask your teacher for help.

A. what

B. that

C. where

D. how

答案：

A. what

B. that

C. where

(答案→)D. how

解析：根据语境可知此题考查的是疑问词+动词不定式的基本用法。此句的含义是我不知道怎样处理这个问题，询问的是解决问题的方式故用疑问副词how，故选D。