题目

30、20世纪70年代，打开我国外交新局面的关键在于                                  ( ) A．参加日内瓦会议                    B．参加万隆会议 C．中美关系正常化                 D．改革开放基本国策的制定 答案：C Peter was so excited _______he received an invitation from his friend to visit Chongqing. A. where       B. that   C. why         D. when