题目

All the work ____, we went to see a fantastic film in the People's Cinema．        A．had been done                                 B．done                          C．having done                                  D．to be done 答案：B用一只平底锅烙饼，锅上只能放两个饼，烙熟饼的一面需要2分钟，两面共需4分钟，现在需要烙熟三个饼，最少需要几分钟？