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The key to the bike ______, he couldn't ride it to school to

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The key to the bike ______, he couldn't ride it to school today. A.lost B.having been lost
现在分词完成式被动语态与过去分词有什么区别,例如这题,the key与lose之间为逻辑上的被动关系,因此直接用过去分词lost不就行了,选A是因为要强调“遗失”这个动作先于ride to school而发生吗?请详细解答现在分词完成式被动语态与过去分词的区别,谢谢!
错了，应该是选B是为了强调“遗失”这个动作先于ride to school而发生吗
The key to the bike ______, he couldn't ride it to school to
首先你要区分开丢钥匙的主语是谁 其实是人丢的钥匙 因此要用主动 从后面的he引导的句子也能看出 而完成时通常强调对现在的影响 因为钥匙丢了 所以才不能骑车去学校 这即是它的影响 因此要选B
再问： 我是这样想的，这是一个“名词+分词”的独立主格结构，作原因状语，the key与lose之间为逻辑上的被动关系，因此要用过去分词，我觉得lost也行吧
再答： 不可以 后半句是真正的主句 它的主语是he 即he作为主语 你们老师应该讲过表示主动的用现在分词 表示被动的用过去分词吧 因此是不能用过去分词的
The key to the bike ______, he couldn't ride it to school to He lost the key _his bike on his way to the school 答案填to为什么? ______ to ride a bike from your school to the park? 1.HE COULD RIDE THE BIKE TO SCHOOL WHEN HE WAS TEN.(改为同义句） he could ride the bike to school when he was ten 改为同义句 I go to school ride the bike everyday the key to the bike is missing 一句英语He wants to ride the machine like a bike and fly it like I usually go to school on the bike为什么不用ride the bike tom goes to school on his bike.he p______ it in the bike sta jack often ______ (ride)a bike to school. ( ) I usually go to school ____ A.ride the bike B.on bike C.