He is late,__is often the case A as B what C it D this 为什么选A

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He is late,__is often the case A as B what C it D this 为什么选A

He is late,__is often the case A as B what C it D this 为什么选A
He is late,__is often the case A as B what C it D this 为什么选A

He is late,__is often the case A as B what C it D this 为什么选A
A
这个句子有俩个谓语都是is
明显 C和D 是错误的
这里是非限制性定语从句,AS引导的从句修饰整个句子,as在从句中做主语 What 不引导定语从句
所以只能选A

选as as这里引导非限制性定语从句.as引导非限制性定语从句时,用来代表整个主句的意义.
再如: As we all know, Taiwan is part of China.

选A,as ,as这里引导非限制性定语从句,指代he is late 这一件事