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71.Would you please not draw pictures on the wall? ----Sorry. I ____ it again. A.am not doing B.dont do C.didnt do D.wont do 72.How long ____ at this factory? A.have you come B.has he in C.will he be D.has he been to 73.Do you know when he ____ back tomorrow? ----Sorry, I dont. When he ____ back. Ill tell you. A.comes; comes B.comes; will come C.will come; comes D.will come; will come 74.I dont know when he ____ .When he ____ ， Ill let you know. A.comes; comes B.will come; comes C.comes; will come 75.We ____ English for three years already. And we can speak a little English now. A.learn B.have learned C.has learned D.will learned 76.My grandpa died six months ago， that is to say， he ____ for half a year. A.has been dead B.died C.was dead D.has died | 
