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:难

    The great pianist performed in the centre of stage, _______ command the keys were producing wonderful tunes.

    A. at whom  B. at whose C. in whom  D. in whose
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