She looks very sad. I want to help her, but I just don’t know ______ to do.

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问题 She looks very sad. I want to help her, but I just don’t know ______ to do.

选项 A、what
B、when
C、how

答案A

解析 sb.doesn’t know what to do这一句型结构表示“某人不知道该怎么办；某人不知如何是好。”do是及物动词动词，what作do的宾语， what to do在英语语言表达中已形成固定用法，而bow是方式状语，不能作do的宾语。

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