-- I don’t know with this problem. It’s too hardYou can ask Mr Wang for help.A. whi

问题补充：

-- I don’t know with this problem. It’s too hard.

--- You can ask Mr Wang for help.

A. which to deal

B. when to deal

C. what to deal

D. how to deal

答案：

A. which to deal

B. when to deal

C. what to deal

(答案→)D. how to deal

解析：D 考查固定短语。“我不知道如何处理这个问题。”宾语是this problem，故不用what做do的宾语，排除C，选D。