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

    Problems ______ at the summit meeting included anti-terrorism, economic cooperation, environmental protection and so on.(  )
    A. study B. studying C. to study D. studied
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