题目内容：

英语选择选什么?
It____that scientists have found the reason___Edison was so clever.
A is said;that B is said;why C said;why

优质解答

A.
it is said...据说.既定用法.
如果用why．．．改成 .
it is said the scientists have found why Edison so clever．
有reason就不用 why了