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:月考试卷 难易度:易

    _______ the question many times, Henry lost patience with his slow brother.(  )
    A. Having explained B. Explained C. To explain D. Having been explained
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