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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
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