How long ________ they ________ (dig) the ditch?
更新时间:2024-11-15 19:52:18have … been digging
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Night________(fall),wehurriedhome.
Matteristhename________(give)toeverythingwhichhasweightandoccupiesspace.
ComradeLi________beinBeijingbecauseIsawhimintownonlyafewminutesago.
How long ________ they ________ (dig) the ditch?
________ (fail) several times, they need some encouragement.
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