How long ________ they ________ (dig) the ditch?
have … been digging
暂无解析
Hefellasleepimmediatelylastnight;hemust________(be)verytired.
Herefusedtotelluswhetherhe________(undertake)thejob.
Hotmetal________asitgrowscooler.
Matteristhename________(give)toeverythingwhichhasweightandoccupiesspace.
Night________(fall),wehurriedhome.