Unless ___ to speak,you should remain silent at the conference． A．invited B．inviting C．being invited D．having invited (‘03上春)为什么选A

I never speak to a ___ ( foreign ). Unless ___ to speak,you should remain silent at the conference． A．invited B．inviting C．being invited D．having invited (‘03上春)为什么选A May l speak to Tom?回答：Speaking.___ ___ ____? 填空:Unless[ ](invite)to speak,you should remain silent at the conference. Unless invited to speak,youshould remain silent at the conference为什么不 用being invited 填空:Unless[ } (invite )to speak,you should remain silent at the conference. What cannot be seen but only heard,and will not speak unless spoken to? the man kept silent in the room unless _____ A spoken B speaking C to speak D spoken to It is polite ___( speak) to the old ______( polite). People like____ children,so speak to others ___(polite) Could you ___ that in English?A.say B.speak C.talk D.speak to 英语单句改错:unless invite to speak ,you should remain silent at the meeting求大神帮助 I won't be able to understand what you say,空格 you speak more slowly.选until 还是 unless t is important that I ___ with Mr.Williams immediately.A.speak B.spoke C.will speak D.to speak will you go to the dinner party ? I won't go unless Tom ___（invite） You mustn't take photos here unless you ___(allow) to.为什么? You mustn't take photos here unless you ___(allow) to.为什么? How can you improve your spoken english ,dear?You never speak english ___ you really have toA because B since C unless D before