问题
选择题
During our stay in London, the guide book ___ a great help. We all had a wonderful time.
A. behaved B conducted C. served D. proved
答案
答案：D
考查动词辨析：A. behaved举止，B conducted组织，实施C. served服务D. proved证明是，句意是;我们在伦敦期间，指南证明很有用，我们玩得很愉快。选D。
