求助TN24-15，there are选项正确了？

Irisyf

A recent United States Census Bureau report shows that there are more than three times as many households where the children and grandchildren are living in their grandparents’ home as compared to households where the grandparents are living in their children’s or grandchildren’s home.

A.      as compared to households where the

B.       as there are households where the

C.      as those whose
D.      than compared to those where the
E.       than there are whose


LZ第一步看主干：A recent United States Census Bureau report shows that there are more than three times as many households where the children and grandchildren are living in their grandparents’ home as compared to households where the grandparents are living in their children’s or grandchildren’s home.
DE直接排除，as as
A排除，as 和compared to
C毛病在于those的指代对象太多不知道哪个
正确选项B，问题来了：
there are more than three times as many households (where... ) as there are households (where ...)
1 as many A as B, A和B有没有结构上平行的要求？
2 两个there are 结构应该是平行的，两个where也显得非常对称。可是LZ怎么看怎么觉得怪异诶，，，真不习惯。


求解啊求讨论求各位NN指点迷津，LZ在这题上范纠结了，，，，，，，，

Irisyf

顶起来，求讨论求解释啊~

starry0328

好像是there be句型的比较前后都得有there be，虽然这是一个2012年的讨论……