6、gledD.leading15.Weareinvitedtoaparty____inourclubnextFriday.A.tobeheldB.heldC.beingheldD.holding16.He is a man of great experience, __________ much can be learned.A. who B. that C. from which D. from whom 17.-IhearDavidhasbeentoBeijingtwice.-_______and_________.A.Sohehas;sohaveIB.Sohashe;sohaveIC.So