on entering the workshop he found many students worked there 请问这里为什么用ON 和 ON在这里是什么意

英语翻译On entering the room,we saw no one. （ ）the room,a letter was found on the ground.A.Entering B.Having entered C.Entered D.He entering work on the relationship work on the （ ）the room,a letter was found on the ground.A.Entering B.Having entered C.Entered D.Mr Green entering ____the room,a letter was laid on the ground.A.Entering B.Having entered C.He entered D.Mrs GrD.Mrs Green entering 为什么C不行呢 Remember ________ on the door before you _______other's rooms.Yes,I willA to knock ; entering B knock ; enterC to knock ; enter D knocking ; entering Are entering into the blue 翻译:work on the computer work on the computer例句 I work on the day ____the room,a letter was laid on the ground.A.Entering B.Having entered C.He entered D.Mrs Gr on entering the workshop he found many students worked there 请问这里为什么用ON 和 ON在这里是什么意 man entering work positions that have been taken over by 一道高中英语题.求解~谢谢20. ______ the room, a letter was laid on the ground.A. Entering B. Having enteredC. He entered D. Mrs Green entering为什么选D不选A啊.?求解 ~谢谢. We should k____at the door before entering. 填work、works或workingBill____(work) on the work on the office的意思