题目

------ Pity that we missed _____ 9 o’clock bus. ------ Don’t worry. There’s a bus every hour on _____ hour.   A. the; an              B. an; an              C. the; the         D. an; the 答案：     C__ an old worker, so he knew exactly what to do.A．BeingB．Having beenC．AsD．He was