6.The road was blocked and that is _____ he didn’t arrive on

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6.The road was blocked and that is _____ he didn’t arrive on time.
A.the reason at which B.why C.the reason which D.what 这题为什么选B啊,

如果选AC,则是用定语从句修饰主句表语th reason 再答：但是定语从句he didn't arrive缺少原因状语 for the reason，所以从句前面必须是 why 或者 for which，排除AC
再答： D更不对了，从句又不缺少what这个名词性成分
再答： B 使用why引导表语从句，而且why又在从句中充当原因状语
再答：固定句型：
This/It/That is/was why...
这/那是...为什么...的(原因)。

he was so —— thought that he didn't see the pole on the road The reason why he didn’t attend the meeting is that he was i Because he didn't finish the work on time and was fired by t The reason why he didn't go to school is that he was ill.是什么 The problem was that he didn't know what would hurt her and He didn't arrive until the meeting was nearly over,for the s The reason _____he was against our plan is that he didn't tr didn't study hard.He is _____ failing the exam. The reason _____ he explained is ___ she was ill. A．that , t Don't _____(play) on the road. The reason why he didn't go to school was that he was ill.为什 The reason ＿he didn't come was ＿ he was ill .A、why ,that B、