一道高二英语选择题Ofthe9500drivers___sincethebeginningoftheyear,23%werefound___roadknowledge.
A.tested...lackingB.tested...lacked
C.havingbeentasted...tolackD.tohavebeentested...lack
答案是A,请问第一格能填havingbeentested吗,请写明原因谢谢
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