单项选择题
A．when and how the umbrella was invented B．why the umbrella was so popular in Europe C．the development of the umbrella D．the history and use of the umbrella
A．the man was coming to tune her piano B．Mrs. Peters received a telephone call from the shop C．the piano was sent to her house at 10 D．Mrs. Peters was going to clean the house
A．the dog would dirty the house B．the piano tuner could see nothing in the house C．the dog disturbed Mrs. Peters D．the piano tuner always took the dog