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13.---Children today find it hard to focus on their study.
---Exactly,as they ______ so many things they think funny to do.(  )
A.foundB.will findC.have foundD.had found

分析 --今天的孩子发现集中精力学习很困难.
--的确如此,因为他们发现有很多好玩的事情可做.

解答 答案:C.
根据today可知谈论的是现在的情况,四个选项中只有B项为现在时.A.叙述过去的情况;B.表将来;D.叙述过去的动作或时间之前就完成的动作.故选C.第一句中it为形式宾语,hard为宾语补足语,后面的不定式为真正的宾语;第二句中they think为一插入语,在理解句意时可忽略;focus on sth专注于某事.

点评 在本句中today这一时间状语是一个参考点,再结合句意来分析句子所描述的内容,最后锁定现在完成时.

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