乌鲁木齐汽车配件批发:Repairs must be done to this road.这句话怎么解释？？？？？？

Repairs must be done to this road.这句话怎么解释？？？？？？ sth must to be done什么意思 . All that must be done _______________(do). Something must be done about it.必须得想个办法。 must＋have done 句型 Has all_can be done ? Awhat,done Bthat,been done Cthat,be done Dwhat,already done what must be must be!什么意思！ being done, done ,to be done的区别 must be是什么意思 can be,may be和must be