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高中英语语法If i were rich,i should help them out._______,i can do

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高中英语语法
If i were rich,i should help them out._______,i can do nothing.
A.As is often the case B.As is it C.As the case is often D.As it is
这道题选哪个,为什么
高中英语语法If i were rich,i should help them out._______,i can do
答案A.As is often the case
.As 是关系代词 代替后面的句子i can do nothing
As引导的是非限制性 定语从句 并作从句中的主语