OG34, 若把选项B改成...

34. A report by the American Academy for the Advance­ment of Science has concluded that much of the currently uncontrolled dioxins to which North Ameri­cans are exposed comes from the incineration of wastes.

(A)  much of the currently uncontrolled dioxins to which North Americans are exposed comes

(B)  much of the currently uncontrolled dioxins that North Americans are exposed to come

(C)  much of the dioxins that are currently uncon­trolled and that North Americans are exposed to comes

(D)  many of the dioxins that are currently uncontrolled and North Americans are exposed to come

(E)   many of the currently uncontrolled dioxins to which North Americans are exposed come (E)

如果我把B改成：many of the currently uncontrolled dioxins those North Americans are exposed to come

可以吗？是否也正确？请指教，谢谢！

I suggest you grab a grammar book and review the relative clauses section.

Thanks.

若把B选项改为many of the currently uncontrolled dioxins that North Americans are exposed to come 正确么？

也就是说that（在后面补上to） 和 to which 可以互换么？

这样改应该是正确的。