He said that he didn’t know to deal with the matter so I left.A. whatB. whenC. whereD. h

问题补充：

He said that he didn’t know to deal with the matter, so I left.

A. what

B. when

C. where

D. how

答案：

A. what

B. when

C. where

D. how

解析：考查疑问词+不定式做宾语的用法：因为deal with处理和how搭配，对方式进行提问时要用how，句意：他说他不知道怎么处理这件事，所以我离开了。选D。