for about 100 years为什么两个介词可以连用?

for about three years(提问) for about 100 years为什么两个介词可以连用? 是at about ten years 还是for about ten years we lived in London for about three years?用for about three years提问 they lived in london for about three years 对for about three years 提问 We lived in America for about three years.[用for about three years提问] Mr Green Lived in China for about ten years.对for about ten years提问 Her uncle has lived there for about eight years.请对 for about eight years提问 people have thought about going into space for many years那个going into space 为什么是宾语 3.He started to collect shells about 4 years ago.( 用for about 4 years 替换4 years ago) He _______(be) abroad for about six years. Tom has worked in a office for about five years. How long ( )you ( )(learn) English?--For about five years. __ three years ago.A,since B,for C,about Then he _____ (work) there for about eight years. my father ____(walk) here for about 20 years meimei ----（learn） english for about 3 years Aubrey Hepburn's successful career 持续for about forty years