题目

The monument was built in honor of the explorer who was believed _____ the river. A. to have discovered    B. to have been discovered C. to discover              D. having been discovered 答案：A 解析: 用不定式的完成式表示动作发生在(定语)从句谓语动作之前。—I hear you have moved into your new house .Congratulations ! -—Thanks. I especially like my study _______ is big and bright. A．which B．who C．what D．why