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,

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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,

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,
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,

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

B,表语从句,这是一个标语从句,首先有and链接证明后面是一个句子,is后面的应该就是从句,之后就可以看出了

这是为什么他不能准时到~

AC本身是错的,没有这种结构。why表示原因,他没准时到达的___,需要填原因。

B
答案只能是B.
the reason 后面要求还得接why,即the reason why。

这是表语从句,跟在了系动词后面,主系表