In order to find the missing child, villagers all they can over the past five hours.
A. did
B. do
C. had done
D. have been doing
网友回答
A. did
B. do
C. had done
(答案→)D. have been doing
解析：句意：在过去的5小时里，村民们为了找到丢失的孩子，一直做他们所能做的一切。over /during/in+the past /last+时间短语，经常与现在完成时连用。故选D。