____carefully for a long time，the opening was a great success
| A．To have been prepared |
| B．Having been prepared |
| C．To be prepared |
| D．Being prepared |
Sam has been appointed ________ manager of the engineering department to take ________ place of George.(2012·重庆)
| A．/；/ | B．the；/ | C．the；the | D．/；the |
Eggs are sold by ________ dozen while the meat is charged by ________ weight.
| A．the；the | B．the；/ | C．/；the | D．/；/ |
Last Sunday，we took ________ guided walk around by ________ signs of the famous town.
| A．the；the | B．a；/ |
| C．the；/ | D．a；the |
________ China's growth is not ________ threat to others.On ________ contrary, it will bring more opportunities to the world.
| A．The；a；/ | B．The；/；the | C．/；a；/ | D．/；a；the |
Obama has been elected ________ first black President of the United States, and the international society expects to have ________ new USA under his leadership.
| A．/；the | B．a；the | C．the；a | D．the；the |