the operation lasted for over four hours.that's how long it___1 went 2 went on 3 went over 4 went off请问选择哪一个,及分别说出每个为什么对与错

the operation,which lasted for over four hours,proved to be very difficult.请问prove to be是词组还是什么,不加to be行不行 The meeting lasted about an hour.lasted在这里是 the requested clipboard operation the sameness in operation the operation has timed The operation has the operation lasted for over four hours.that's how long it___1 went 2 went on 3 went over 4 went off请问选择哪一个,及分别说出每个为什么对与错 请教非限制定语从句与分词短语作定语之间的转换问题.是新概念二中的一句话,请问The operation,which lasted for over four hours,proved to be very difficult可不可以改为The operation lasting for over four hours proved the space ______(fly) lasted five days. How long have the Olympic Games lasted? After the operation什么意思 The operation has timed-out. The rain has lasted several days 这句中has lasted有问题吗? 几道英语选择,麻烦啦1.Taken good care of by his family ,the old man lived ------- three years after the operation .A.other B.more C.another D.every 2.The heavy rain lasted a couple of days,__more than two-thirds of the old townA.flooded B.flo 新概念英语第二册的第77课中的一句话The operation,which lasted for over four hours,proved to be very difficult because of the hard resin which covered the skin.proved to be very difficult,to在这里是作什么用,另外be加形容词 the operation,which lasted for over four hours,proved to be verydifficult because of the hard resin which covered the skin.最后一个,为什么加which,用定语从句hard resin已经是主语了,再加一个which不是多余吗请问可不可以 The doctor p_______ the operation successfully. The doctor performed the operation with succes.