They ______ this boy for quite a few days before they found him.

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问题 They ______ this boy for quite a few days before they found him.

选项 A、have looked for
B、had looked for
C、have been looking for
D、had been looking for

答案D

解析本题考点是动词时态。本句时间状语表示过去，谓语动词表示在过去这一时间之前一直进行的动作，所以用过去完成进行时态。本句大意：他们一直找了好几天才找到这个小男孩。

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大学英语三级A级

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