单项选择题
You cannot be（）careful when driving a car on the superhighway.
A．very B．too C．so D．enough
单项选择题 This is one of the most beautiful songs（）I have ever heard.
单项选择题 The construction of the laboratory（）by the end of the year.
单项选择题 The patient knew nothing about his illness（）the doctor told him.
