He must receive a full-time education until the age of sixteen .这里的until是介词还是连词?

He must receive a full-time education until the age of sixteen .这里的until是介词还是连词? 请英语高手们来看看这道虚拟句.Mr.Green________my letter,otherwise he would have replied before now.A,must have received B,must have failed to receive C,must receive D,must fail to receive otherwise 的虚拟句一般不是其前的句子 We --- the letter yesterday,but it didn't arrive A .ought to receive B .ought to have received C.must have received D.must receive 英语翻译Students must receive a special International Baccalaureate certificate before they can pass the diploma program. Must he come to receive the prize himself?No,he__A.musn'tB.needn'tC.can'tD.shouldn't Don’t you consider it essential enough practice before he takes part in the competition?A.how he will receive B.that he be receivedC.if he will receive D.that he receive 将下列句改被动语态1．I will send a message immediately.2.We must sell all these goods.3.I told you he would receive the parcel in time.4.He has to deliver the letter by hand.5.They must have lost yourletter inthe post. I mailed the letter two weeks ago.She_____it.A.must receive B.can't receiveC.might receive D.must have receivedNowadays computers _________________ widely in our daily life.A.useB.usedC.will useD.are used FU If you receive a letter （offering） you the job,you must replay as soon as possible.为什么 well your not going to get much with a profile like this,remember you must give to receive and you He can't receive the letter because the a ____ on it is wrong. I ____(not receive)a letter from him since he left. if a man receive no guest at home,when abroad he'll have no 改写关于情态动词的过去语态的句子记住是：主+情态动词+be+过去分词 1.I will send a message immediately .2 We must sell all these goods .3 I told you he would receive the pavcel in time 4 He has to deliver the letter by hand what a fuсking ①－Which of the following is NOT correct about Bruce Lee(李小龙）A.He is probably the most famous martial arts actor in kung fu films.B.He learned Wing Chun Kung Fu when he was 18.C.He wrote a book called TAO OF GUNG FU.D.He wanted to be as Po must find hia o_____way of kung fu fighting.