Did you see the accident ________when you were walking past?A.to happen B.happenC.happenedD.is happening选哪个,为什么要专业,还有哪种情况和这个一样,举个例子.

Did you see the doctor? did you see the accident h__ Did you see the accidentthis morning?(happen) Did you go to see the Did you see the full moon? Did you see the little boy( )away? Did you see the email I sent you yesterday?对吗? did you see my Did you see the accident happenDid you see the accident ________ 是happen 还是happened,为什么 Did you see a film at the _______ yesterday evening? did you see the accident h_____?横线处填什么? 用you,see,did,doctor,the连成一句话急! 连词成句 you pandas did see zoo in the? you did the talk sgow interesting see 连词成句 What did you see under the seat?(中文) Did you see the game on TV Friday night What animals did you see? did you ever see snow?