矿用洒水车:Did you see the UFO?When it ____(landed,was landing),I was in the barber' shop!填那个，说一下原因

Did you see the scenery ( )? Did you see the UFO?When it ____(landed,was landing),I was in the barber' shop!填那个，说一下原因 --Did you see Sandy in the manager's office? --Did you see Sandy in the manager's office? Did you see that the children were swimming in the river?(改同意句) Did you see the ____ ____(连续剧）on Tv last night?应该填什么？ Did you see the car parking in front of Tom's 1)How many elephants did you see? --Did you close the door? you can see the flower