He fell asleep immediately last night; he must ________ (be) very tired.
have been
暂无解析
Ifound________toanswerallthequestionswithinthetimegiven.
Agreatnumberofsmallpowerstations________(setup)intheircounty sinceliberation.
Howlong________they________(dig)theditch?
Thistest________anumberofmultiplechoicequestions.
Night________(fall),wehurriedhome.
