The police (look) ______ for the lost child all day long.

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问题 The police (look) ______ for the lost child all day long.

选项

答案have been looking

解析 本题考查动词时态,测试的是现在完成进行时用法。根据状语all day long可知谓语动词要用现在完成进行时,表示该动作的持续性。
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