单选题More than 10 000 relics &

问题补充：

单选题Morethan10,000relics,____between5,000to3,000BC,____atSanxingduisinceitwasfirstdiscovered.A.dating back to, was dug upB.dating back to, have been dug upC.dated back to, has been dug upD.dated back to, were dug up

答案：

B