单项选择题
Yesterday I（）in the street when I （）across one of my old classmates.
A.walked；was comingB.was walking；cameC.walked；cameD.was walking；was coming
单项选择题 I（）my driving test at this time last week．
单项选择题 Christopher Reeve said since his life was saved again，he had never thought of（）．
单项选择题 Go and（）when the train is leaving．
