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：考查动词时态。从过去某个时间开始一直持续到现在，还将继续下去，要用现在完成进行时。时间状语是 over the past five hours, 所以是从过去到现在 将来还有可能继续进行，直到找到孩子为止，故用现在完成进行时。句意：为了找到失踪的孩子，村民们在过去的五小时里做了他们所能做到的一切。