She looks very sad. I want to help her , but I just don’t knowDto do.A. what B. when C. ho

发布时间：2020-11-23 00:13:40

She looks very sad. I want to help her , but I just don’t knowD to do.
 A. what     B. when   C. how      D. where

网友回答

解析：“疑问词 + 动词不定式”是英语中常用的一种结构。在句中可以作主语、动词或介词的宾语以及表语。
以上问题属网友观点，不代表本站立场，仅供参考！