By the end of the year 2008, many events, such as the holding of the Olympics and the launch of spacecraft Shenzhou VII,          .

A．will have been taken place                            B．will have taken place

C．have been taking place                                 D．have been taken place

By the end of the year 2008, many important events, such as the holding of the Olympics and the launch of spacecraft Shenzhou VII,          ．

A．would have taken place                               B．had taken place

C．took place                                  D．had been taken place