A．knowB．knewC．have knownD．had known……

单项选择题A．I have left the homeB．I leave from homeC．leaving homeD．to leave home

单项选择题A．stop herB．stops herC．and stopped herD．to stop her

单项选择题A．for the train to startB．the train startingC．the train startD．for the train starting

单项选择题A．what he is likeB．what is he likeC．how he isD．how is he

单项选择题A．had been workingB．have been workingC．workedD．have worked