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

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.