She looks very sad. I want to help her, but I just don’t know to do it.A. whatB. whenC. h

发布时间：2020-08-21 01:13:48

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

网友回答

A. what
B. when
(答案→)C. how
D. which
解析：疑问词+to do sth是固定搭配，充当某个句子成分。在此句中充当句子的宾语。
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