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8.Our troop have difficulty in_____ the enemy lines.求解答

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8.Our troop have difficulty in_____ the enemy lines.求解答
A)break up B)breaking through
C)broke down D)breaking into
答案:B 解析:break up“解散,分解,分手”等含义;break through“突破”;break down“(机器等)出故障”;break into“闯入”.由have difficulty in doing sht(做某事有困难)可排除A和C;由句意:我们突破敌人的防线有困难,可知答案为B.