用must be done 和must be doing 造句再加个 as a result

must be done和 must have done区别 用must be done 和must be doing 造句再加个 as a result must have done和must be的区别?权威 something must to be done和something must be done区别 must be must have done 区别 must have been done/must be done求解两者异同 用Something must be done to句型造十个句子 RRT:V MUST BE DONE FIRST 用what或者who合并句子all can be done.all must be done 合并句子all can be done.all must be done Justice must not only be done,but must be seen to be done must have been done must have done must be和must have been有什么区别he must have been sleeping.为什么这里要用must have been而不用must be All that must be done----(do)难道填All that must be done done(do)吗？汗 What must be done if wildlife protection to be succeed?回答这个问题.用英语回答..一两句话 must have done和have done有什么区别 为什么要加ed以及must be done 和must be doingWe must be prepared for any eventuality.我们必须有所准备以防万一.为什么prepare要加ed?这里我没看出来有被动语态呀?must be done 和must be doing有什么区别?一个是 must be