That is the reason ___ he can't say.A.thatB.whyreason加that还是 why怎么分?

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That is the reason ___ he can't say.
A.that
B.why
reason加that还是 why怎么分?

the reason why+ 主语+ 谓语+ 宾语(why 作状语)
the reson that+ 主语+ 谓语(that作宾语)
本题选why.

why
the reason why...这是定于从句中reason的一个固定搭配.外国人都是这么说的

that 是个同谓语从句

why

固定搭配

WHY
可根据题意