He went on working after having a look at me.为什么用过去式went?

After having a rest,they went on ____ .为什么答案是 working?不应该是to They went on working after ten minutes_____ The rain having stopped,he went out for a walk.为什么要用having? he went on working through the night The farmers went on working,_____ A.hours after hours B.hour ______ he was tired he went on working.A.Even B.Yet C.Althou Tired he was,he went on working without any rest.A because B we didn't take a rest .we went on working=we went on working he went on working to eleven last night与he went on to work t Although he was ill yesterday,he went on working.(用but改写) Although he was ill,________he went on working.A.but B.yet C He（ ）out of the window for a moment and then went on working