A 翻译:你能想像得到他在帮助这个村的人意识到保护环境的重要性时所遇到的困难吗? he had 是修饰difficulty的.to help the villagers to realize the importance of protecting the environment是difficulty 的补充.
选B,Can you think of the difficulty (he had _the villagers to realize the importance of protecting the environment)? 成分分析:Can you think of the difficulty ?是一般疑问句。括号中是difficulty的同位语从句,表示“困难”的内容。这个同位语从句用过去完成时态。