—I don’t know with this problem. It’s too hard. —You can ask Mr Wang for help.A. which to

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：考查疑问词+不定式作宾语。根据句意我不知道如何处理这个问题，可得知选D。