英语长句求教大神指点一二itmadegoodsensetothousandsofpeasantfamiliestoineffeceworkful-timeatwhattheyhadbeenabletodoonlypart-timepreviouslybecauseoftherequirementtoworkforthegovernment:growriceforthemark

　　英语长句求教大神指点一二

　　itmadegoodsensetothousandsofpeasantfamiliestoineffecework

　　ful-timeatwhattheyhadbeenabletodoonlypart-timepreviously

　　becauseoftherequirementtoworkforthegovernment:growriceforthe

　　marketplace

　　这句话里的atwhattheyhadbeenabletodoonlypart-timepreviously修饰哪一个部分?