单选题
They ______ this boy for quite a few days before they found him.
A、
have looked for
B、
have been looking for
C、
had looked for
D、
had been looking for
【正确答案】
D
【答案解析】
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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