求助一道四级真题46.The sale usually takes place outside the house,with the audience _____ on benches,chairs or boxes.A) having seated B) seating C) seated D) having been seated 我看到这么一道四级真题,为什么?为什么不选b呢?

求助一道四级真题46.The sale usually takes place outside the house,with the audience _____ on benches,chairs or boxes.A) having seated B) seating C) seated D) having been seated 我看到这么一道四级真题,为什么?为什么不选b呢? Are the shoes on sale? the sweater are 介词sale sale the difference between for sale and on sale?english learning on sale和for sale的区别 一道词汇应用题,求解吉姆告诉我下个星期那家商店将有一些新的光碟出售.Jim told me there would be some new VCDs ___________ in the shop the next week.这里用on sale 还是for sale两者有什 for sale ,on saleHow do you like the pizza for sale--very good.为什么是for sale不是on sale The yellow sweaters are -----sale-------the store 一道逻辑题求助 一道物理题求助 求助一道题目. 求助一道高数题, 求助一道几何题? 求助一道英语题目 求助一道数独题 RT 求助一道线性代数题 求助,救命一道题 求助一道初中物理题!