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4.Large amounts of soilhave been washed(wash) away by the heavy rain recently.Action must be taken to prevent serious damage.

分析 最近,大量的土壤被大雨冲走了,必须采取措施来阻止严重的破坏.

解答 答案:have been washed
根据句子里recently可知,句子时态用现在完成时,主语为Large amounts of soil修饰不可数名词,意为"大量的土壤",所以谓语动词用单数形式.

点评 考生需掌握一些固定短语并结合具体时态灵活运用.

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