关于yet用法请教： Why have we had no visitors from outer space yet ? 此句为什么在句末加上yet ? 表示什么意思? yet 在英语中还有哪些用法? 谢谢

关于yet用法请教： Why have we had no visitors from outer space yet ? 此句为什么在句末加上yet ? 表示什么意思? yet 在英语中还有哪些用法? 谢谢 关于must,can表明推测语气时的用法.Why don't you phone Kate now?She ____ yet.A.can't have leftB.wouldn't have leftC.might have leftD.must have left为什么不选D选B? 英语 关于yet的用法There are many sounds which have a meaning and yet are not words .有许多声音有意义但不是词..这里的yet是怎么一个用法嗯? 关于英语yet在句子中的用法我在书中看见Have you started your homework yet?在这里面YET的作用是什么?另外用法也介绍下, yet的用法yet用法 请教have got to的用法 why have you not finished it yet?和why haven't you finished it yet?有什么区别 yet的用法 yet 都什么用法 谁知道yet的用法, ever,never,yet 的用法Have you ( ) been to Beijing?No,( ) A ever ever B yet ,never C ever never why have not you accomplished your taskes yet?you______to finishi them last fri语法题 Have you been shopping yet?been的用法应该是怎么用呢? 【转】请教德语关于ein,eine,einen的用法 老师,请教您个关于but作介词的用法. 关于eaten和ate的用法Have you eaten lunch yet?Yes,I ate a few minutes ago.这句 Have you eaten lunch yet?里面的eaten 可以换成ate吗?那I ate a few minutes ago里面的ate 可以换成eaten吗? Have you read____newspaper yet? 造句：Have you .yet?