题目内容

11.The chief engineer together with his colleagueshas been looking for/has looked fornew scientific methods of farming since five years ago.(look)
五年以来,总工程师和他的同事们一起一直在寻找新的科学农耕方法.

分析 has been looking for/has looked for

解答 本题考查的是时态.句子有since five years ago,所以主句应该用现在完成时或现在完成进行时,另外,句子的主语是The chief engineer,是第三人称单数,所以完成时助动词用has,主语The chief engineer 和look之间的关系是主动关系,所以用主动形式.
故本题答案为:has been looking for/has looked for.

点评 考查此类试题,需要注意时态语态以及主谓一致.

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