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Of the 9500 drivers ___ since the beginning of the year,23%

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Of the 9500 drivers ___ since the beginning of the year,23% were found ___ road knowledge.
A.tested...lacking B.tested...lacked
C.having been tasted...to lack D.to have been tested...lack
请问第一格能填having been tested吗,请写明原因谢谢
Of the 9500 drivers ___ since the beginning of the year,23%
不能用having been tested.
这句前面有个of,说明后面的是定语.
整个句子还原就是:23% of the 9500 drivers (which were) tested since the beginning of the year were found lacking road knowledge.
如果你用having been done结构,这个which 就不能省了,which肯定是和后面的be动词一起省的.