Mr Song taught in this school for 10 year (对括号提问

Mr Song taught in this school for 10 year (对括号提问 he taught in this school for 10 years.对for 10 years 提问. Now Mr Black taught in another school.This year I have taught in this school for ong year(改为同义句） Mr.Brown has taught English in the school ( since 2000).对括号部 He has taught in our school for 4 years（对for 4 years提问） Miss yang has taught in this school for five years 对 for fiv there are (thirty)teachers in this school.对括号提问 He taught English at this school for two years（同义句） Two year 1.He has been writing this story (for one year).(对括号部分提问) Mr Black has taught English in our school 2001选择:A.for B.in 1,Mr Black had taught in this school by 1970（改为否定句）