He got there at around 4o'clock in the afternoon.为什么用around不用about

He got there at around 4o'clock in the afternoon.为什么用around不用about he got there at a___________ 4 o'clock in the afternoon He left at ten.（by the time I got there作时间状语改写句子） He ____ ____ by the time I got there She got there at 8:00.I got there at 8:00,too合并 _ got there _ _ _time 同义句 1.At last he finished weiting the story.( )( )( )he finished writing the story.还有：1.Mary needs another three pens .Mary needs( )( )pens.2.They got there finally.( )( )( ) they got there --Did you meet the professor at the airport?--No,he _____ by the time I _____ there.A.had left;got B.has left ;reached C.was leaving ;got D.left ;had got 将句子变否定句1.There is some oranges in the bag 2.I can draw pictures 3.He hoes homework at home 4.He had got some brothers 5.He has English at 9:00 介词什么情况下可以和副词连用,什么情况下不可以?还是不太懂在词组get home ,go there,come here.中home,there,here均是地点副词前面均不用介词；而在词组at around at six o'clock 和 at about at six o'clock arou i got used to the l_____ there at once. Did you see Tom at the party?No,he()by the time I got there A leftB was leavingC had left D was left选择,分析下 She got there at 8：00.I got there at 8：00,too.（和拼为一句） By the time that we got there,he was out. in the afternoon he got b____ home at 4:00 he got to the small town at last同义句 He got the color TV set at a high p( ). Did you see Mr Brown at the party yesterday evening?No,__for half an hour when l got there.A.I cannotB.he had leftC.he has leftD.he would be away讲解. He said that he ____(ring) me up when he got there He said that he ____(ring) me up when he got there为什么是would ring?