Use present perfect or past perfect): 1.i received a letter from susan a few days ago. i ……… to i receive) letters from her since she left. 2. there are a lot of dirty i dishes. we ………….(not to wash up) since morning. 3.i telephoned her after i …………(to think over) her offer. 4. he gave up smoking after he …………(to smoke) for 20 years. 5. how long you …………(to be engaged) before 1 you got married? 6. we ………….(to be) here since 10 o'clock. 7. at last he……….. (to finish) iris book. he ………… write) it for ten years.

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