He began to work in his thirties是什么意思?

He began to work in his thirties是什么意思? It was in 1990 ------he began to work.It was 1990 ------he began to work.用when/that填空 My brother began to work when he was sixteen. My brother began to work ---- ---- ---- ---- sixteenHe is the oldest teacher in the school.He is ----- ---- ---- ---- teacher in the school. he began to work in this shop several years ago的近意 he began to work at__dawn every morning because he was heavily in ___debta / /b / thec the /dthe the He began to work three years ago (改同义句)He ______ _______ _______ in the city for past three years he began to work THERE( ) A.on his fifty B.at age of fifty C.when he fifty D.in his fifties说原因 He began to work there ( )A.on his fifty B.at age of fifty C.when he fifty D.in his fifties 翻译句子：他是2001年在这里工作的 He began to work here in 2001中的in 为什么不能用since 翻译：He began to take up painting in his fifties. Not until three years ago,did he begin to work outside.这句子中为什么不用 he began to work Professor Luo began to work in this lab five hours ago的同义句改为：It _____ ______ five hours _____Professor Luo began to work in this lab the farmers began to work in the fields _____dawn (in ,on,at,until) 用old,my,was,to,father,he,years,began,when,when,work,twenty连词成句 he went into his room, turned up the light and began to work这句话对不对 His father began to work as___as he was seventeenAold Bearly Cfar Dbefore哪个为什么? His father began to work since he was seven years old.这个句子有错吗? Mark Twain is a famous writer from Ameraica.He was born in 1835 in Missouri.He got work and began work at the age of twelve.He wrote for a newspaper but later,he got work on a boat.He went to Mew Yourk and other cities,We don not know the excat date