walk down the stairs的stairs为什么不能用ladders

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• At midnight,he____ his way down the stairs in order not to wake others.a.wound b.fought c.pushed d.felt为什么选D,其他为什么不能用?
• There are a fire drill yesterday.找出句子中的错误并改正We must walk quick down the stairs.They are talked about the weather because they are going to have a picnic.You mustn't eat and drink on the bus.
• 找出下面句子中的错误并改正在后面的横线上.1.We must keep quiet ai the library._______2.There are a fire drill yesterday.________3.We must walk quick down the stairs._______4.They are talked about the weather because they are going to have a picnic._______5.You mustn't eat and brink on the bus._____连词成句,注意标点符号和字母大小写.1.Peter,an,lady,helped,old,on,way,his,school,to,(.)_________________________________________________2.she,every,goes,morning,school,to,foot,on,(.）_____________
• walk down the stairs的stairs为什么不能用ladders
• 高中英语完成句子一题,分词做状语时,过去分词和现在分词的完成时态该如何区分-----------------------,the dead forests rotted away and became coal.{枯木被深深埋在了地下,然后腐烂变成了煤｝答案是Buried deep down in the earth,解释是过去分词在这里表被动而且表完成我想问为什么不能用Having been buried deep down in the earth,不也可以表被动和完成吗
• walk down the stairs的stairs为什么不能用ladders
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