什么时候用the什么时候用a_什么时候用the什么时候用a

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∪▂∪ The reason后到底填什么?很多人第一空就错除非语境里已经知道explained什么。因此这里定语从句缺少的是宾语,不是状语,所以不能用why,应该用which或者that,关系代词which/that在从句中作explained的宾语,甚至还可以省略,变成The reason he explained was that.。所以第一个空能排除A和B,剩下C和D。 再看第二个空,The reaso...

The Safety Secret Hidden in a Sheet of Glassa single pane of glass to a standard—what exactly is the “safety code” behind a piece of glass? The tempered laminated glass produced in Rizhao, even when shattered to bits, sends no fragments flying outward. 从一块玻璃到一项标准,一块玻璃的“安全密码”到底是什么?日照生产的钢...

˙▂˙ 别被过去骗了:这道时态题为什么选它表示过去某一时刻正在进行的动作,常用来提供背景,也常和when、while、at that time、at eight last night连用,还可以和一般过去时搭配,比如I was walking down the street when I met him,或者When I got home, she was cooking,都是用一个正在进行的长动作作为背景,另一个短动作发生。题...

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