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6.I called you at ten, but there was no reply. Oh, that was probably when I ________ a shower. A. am taking B. took C. were to take D. was taking 7.Have you ever worked with a tape recorder? I ________ it a lot when I was studying French in school. A. used B. was used C. have used D. had used 8. You must have met him the other day. Oh, no, I ________ . A. hadnt B. mustnt C. havent D. didnt 9. Which flight ________ ? I want to catch the 13:00. A. you are to catch B. are you catching C. do you catch D. have you caught 10. Excuse me, sir. Would you do me a favor? Of course. What is it? I ________ if you could tell me how to fill out this form. A. had wondered B. was wondering C. would wonder D. did wonder | 
