She has been sitting there for more than 2 hours.去掉for可以吗,为什么,

She has been sitting there for more than 2 hours.去掉for可以吗,为什么, Where has she been? She has been hopeless是什么意思? she has been heard of 翻译:She has never been there,has she? she has been to beijing (twice)提问 she has not been around this week She has been working for 20 hours She has been to Xi'an b( ). Perhaps she has been in place then? She has been collecting stamps谢谢了 that piece of chese has been sitting on the court since last spring. That piece of cheece has been sitting on the biacktop since last spring. The boy has been sitting there__noonA.at B.in C.for D.since 是how long has she been learning…还是how long has been she learning… She has been collecting stampsл!She has been collecting stamps谢! She has been writing poems since her childhool.(改为复合句) She has been writing poems since___ Not only has she been to America,but also she has been to Japan中为什么用has she