摘要:13.D.非谓语动词作状语.首先主句主语one与offer之间的关系为被动关系.所以排除A.B两项.C项与when连用不能作状语.When offered help, one often says...相当于When one is offered help, one often says....本题属于状语从句的紧缩现象.

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