题目内容
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 |
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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A.what | B.when | C.how | D.which |