In order to find the missing child, villagers _______ all they can over the past five hours.
A．didB．doC．had doneD．have been doing
D

試題分析：句意：在過去的5小時(shí)里，村民們?yōu)榱苏业絹G失的孩子，一直做他們所能做的一切。over /during/in+the past /last+時(shí)間短語，經(jīng)常與現(xiàn)在完成時(shí)連用。故選D。
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