She has been over his strange letter for several weeks, but she still figures out nothing about it.

A. puzzling B. worried

C. troubled D. anxious

 

A

【解析】句意: 她對他那封奇怪的信苦苦思索了好幾周, 可還是沒弄明白。puzzle over意為“對……苦苦思索”。

 

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