标题: OG 87 [打印本页] 作者: Eileenl 时间: 2010-11-11 21:21 标题: OG 87 87. In an effort to reduce their inventories, Italian vintners have cut prices; their wines have been priced to sell, and they are. (A) have been priced to sell, and they are (B) are priced to sell, and they have (C) are priced to sell, and they do (D) are being priced to sell, and have (E) had been priced to sell, and they have OG在解释中说A- Th ey are would require selling to complete it, not sell. B -Th ey have would require sold to complete it, not sell 为什么如果前面是selling,后面就是are?前面是sold,后面就是have?作者: 秋老虎 时间: 2010-11-11 22:23
助动词补出原则。 be doing就补be have done就补have 如果是动词原形就是do