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:中档

    The volcano was about to blow _____ a large river run caused by rapidly melting glacier ice.

    A. when  B. if  C. but  D. till
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