When he got off the bus,it happend-B-.

When he got off the bus,it happend_B_.A to rain B to be raining C raining D to raining2._C_from the moon,the earth with water__seventy percent of its surface appears as"a blue ball" 为什么?A seen;coverd B .seing;covering C.seen;covering D to see;to cover3.We walked as fast as we could ,__to get there on timeA hoping B to hope C hoped D being hoped 为什么不是A4.They knew him very well.They had seen him__up from childhoodA grow B grew C was growing D to grow 什么不是D5.The examination was so difficult that almost everybody failed__it.A in passing B to pass C to have passed D passing为什么不是A?6.__into many languages,but with quite a long historyA being translated B having translated C to be translated D having been translated为什么是D?7.Travelling is __,but we usually feel__when we are back home from travel.A interesting;tired B interested;tiring C interesting;tiring D interested;tired?8.Althouh she saw so many people_in front of her,she looked calmAsiting B seating C sit D seated9.__for many years,nobody could recognize him.A put in prison B the man putting in prison C the man having been put in prisonD the man being put in prison?10.She is a well-known wrier and speaker.She devoted all her life__.A to write and lecturing B to writing and lecuing C to write and lecture D writing and lecturing.11.The doctors did everything they__save the__old woman but failedA could;dead B could to;dead C could;dying D could to;dying抄自成人高考高起点解题指导~希望能讲解一下.