找出下列句子的一處 語法錯誤：
Moreover, there would also exist opportunities to meet some local friends who would be perfect guide to help make a trip more complete. We can learn about different cultures from local residents, and their advice would be invaluable to us since they are more familiar with the local environment.
♜ 適用考題：
Which of the following three factors contributes the most to an enjoyable vacation? a. good food b. good location c. good friends to travel with you. (2013.4.14)
答案：
Moreover, there would also exist opportunities to meet some local friends who would be perfect guides to help make a trip more complete. We can learn about different cultures from local residents, and their advice would be invaluable to us since they are more familiar with the local environment.