职教组卷基于海量职教高考试题库建立的在线组卷及学习系统
职教组卷
  • 题型:英语知识运用 题类:其他 难易度:中档

    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
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