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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 --今天的孩子發(fā)現集中精力學習很困難．
--的確如此，因為他們發(fā)現有很多好玩的事情可做．

解答 答案：C．
根據today可知談論的是現在的情況，四個選項中只有B項為現在時．A．敘述過去的情況；B．表將來；D．敘述過去的動作或時間之前就完成的動作．故選C．第一句中it為形式賓語，hard為賓語補足語，后面的不定式為真正的賓語；第二句中they think為一插入語，在理解句意時可忽略；focus on sth專注于某事．

點評 在本句中today這一時間狀語是一個參考點，再結合句意來分析句子所描述的內容，最后鎖定現在完成時．

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