I’ve lost my longest ruler,___I like very much.

I've lost my longest ruler,___I like very much.
He's lost his longer ruler,____he likes very much.
A.the one B.which C.what D.that请问为什么第一题选D,第二题选B?

I've lost my longest ruler that I like very much.(该题干应该无逗号,先行词最高级时,关系代词只能用that);
He's lost his longer ruler,which he likes very much.(该题为为限制性定语从句,只能用which)
仅供参考!