in working days ,还是on working days

in working days ,还是on working days in those days还是on those days I am working 19 days in a row In the days following对吗?还是In the following days in the old days the working people in our country____(look）down on Keep working,working 8 days a week! business days 和 working days 区辨 是at school days 还是 on school days 还是 in school days 用on还是用in windy days mrs lee is working on a _____( a set of instructions in a computer ) these days my father ______(work) in that factory these days.用完成时还是现在进行时?has worked 还是is working答案是isworking,那为什么呢?具体的. 在工作中是in working time还是on还是用at, 15 Days PDC 15 Days AMS 15 DAYS T/TDeposit In Advance T/T IN ADVANCE C.O.D.T/T Half In Advance 30% deposit in advance15 Days PDC 15 Days AMS15 DAYS T/T I used to ---(work) in Harbinwork 还是working? Days in bring one's thought to 完成句子These photos brought my thoughts to those days when I was working in India.These photos _____ _____ _____ those days when I was working in India. 30%T.T in advance,the balance by the copy of B/L within 10 working days. If one worker can complete ajob in 6 days and asecond worker takes 12 days to complete the same job.how long will it take them working together?