Now I _____ to work by bike instead of by car as there are too many cars on the road in rush hours.
Now I \_\_\_\__ to work by bike instead of by car as there are too many cars on the road in rush hours.
时态
It seemed to me that what she saw and heard _____ very interesting.
It seemed to me that what she saw and heard \_\_\_\__ very interesting.
_____ got in the wheat than it began to rain heavily.
\_\_\_\__ got in the wheat than it began to rain heavily.
Her hair and coat were wet because it _____.
Her hair and coat were wet because it \_\_\_\__.
时态数据库设计理论.pdf
本书共分七章，内容包括：时态数据库设计研究的概况、时态模块模式与时态模块、时态函数依赖和集细于关系、时态类型和它的封闭集处理、TFD的推导规则、时态类型处理中的细于关系矩阵、时态类型集的封闭集及其公共最大下界、有限导出时态类型集等。