【题目】 Some experts thought that the standards of education __________ these years in China.
A. has declined B. had declined
C. has raised D. had raised
在线课程【答案】B
【解析】
试题分析：B考查动词的时态语态。分析句子，that引导的是宾语从句，从句中的动作发生在主句谓语thought之前，故用过去完成时，表示动作已经完成，并且对现在造成了影响。故答案为B选项。