题目
8. It is reported that by the end of this week the output of automobiles in the factory-|||-__ by 20%.-|||-A.will be rising B.has been rising-|||-C.will have risen D.had risen-|||-9. I __ to the dentist`s this morning.-|||-A.have been B.have gone C.had gone D.go-|||-10. I __ human nature all my life.-|||-A.am studying B.studied C.have studied D.will study-|||-11. John went back home by plane,but his mother ___ before he arrived.-|||-__-|||-A.has died B.had died-|||-C.may have died D.has been dying-|||-12. John __ too hard,so his boss told him to take a holiday.-|||-A.is working B.had worked-|||-C.had been working D.had been worked

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