For several years this group (has been trying) to get the city government to help bicycle riders.为什么括号中用has been trying,而不是has tried?

Have been working for several years for several years 用于什么时态 live for several hundred years 等于什么 I ______(know) Kitty for several years. several years前面跟什么?several years前面跟since还是for啊... several years ago For several years this group has tried to get help for bike riders. He has been （ ） for several years括号中填died 还是dead She has been in China for several years.She() be a big girl now. For several years,people in America and Europe______(enjoy)teleshopping.用其适当形式填空 She has kept()English for several years A.practising saying B.practising speaking C. for several years after you go,I will accompany you to walk together, Lee __________ (learn) English for several years,and at last he _________ (master) the irregular verbs. I bought a house _______ what I had saved for several years. 这个句子For several years,I have bought many flowers from the little girl.是否正确? I haven’t seen your father for several years.Where has he gone --oh,he ___for three years. Over several thousand years of development,Chinese medicine has attracted great attention _______ its unique and marvelous effects.A.to B.in C.on D.for为什么选D,我选了ANo conclusion _______ about whether to tear down the old buildings for a th in several years翻译中文