问题
选择题
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
答案
答案：C
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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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
答案：C
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。