be puzzled as to what to do 有没有这个说法

be puzzled by 为什么所困惑 he was puzzled by this question .他对这道题目困惑.
be puzzled over 对……苦苦思考.he was puzzled over this question.他正在思考这个题目.
by puzzled by what to do对该干什么感到困惑

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