at some certain time of his or her life 是什么意思

at some certain time of his or her life 是什么意思 at some certain time some certain kinks of in his spare time or at his spare time Each of the students _____ his or her homework on time.A doi learned and same of culture we way the some at time life the Each of the students,working hard at his or her lessons,hope 帮忙作几道英语单选题Each of the students,working hard at his or her le 高一英语 急!1 Each of the students ,working hard at his or her le Each of the students works hard at his or her lessons,__ to each of the students,working hard at his or her lessons,____ some of us( )(be)crazy about his songs at that time