31. For advice, they ________ one of the school’s most experienced teachers.
A. turned on B. turned to C. turned down D. turned off
出自:大学英语第二册

完成拼图验证

按住下方滑块,将拼图拖到缺口处后松开。

拼图背景,将小拼图拖到缺口处
向右拖动滑块