请选择ABCD7X+Z6r2i(Q2J8J,[4j-r.q4x;M2R Of the 9，500 drivers _________ since the beginning of the year，23% were found _________ in road knowledge.4H6r7^.V2E.y;K3@4{
A.tested;lacking4H6r7^.V2E.y;K3@4{
B.having been tested;to lack4H6r7^.V2E.y;K3@4{
C.tested;lacked4H6r7^.V2E.y;K3@4{
D.to have been tested;lack4H6r7^.V2E.y;K3@4{