ENGLISH
All flights ___ because of the snowstorm ,we could do nothing but take the train A had been cancelled B have been cancelled C were cancelled D having been cancelled 为什么~解释一下~
答案是D,前面三个用于该句中,都会形成两个并列完整的句子,而没有连接词,都会出现语法错误.
答：All flights _____ because of the snowstorm ,many passengers could do nothing but...详情>>
答：B 被动语态，be found to do. A中的made与found均为过去分词，冲突！详情>>
问：hArd work 和hArd--working有什么区别
答：一个是名词 一个是形容词撒详情>>
