Yesterday he sold out all his stamps at ____ he thought was a reasonable price.这里为什么不能用which?

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Yesterday he sold out all his stamps at ____ he thought was a reasonable price.
这里为什么不能用which?

用 what
what was a reasonable price 是一个宾语从句,做at 的宾语,而 he thought 是插入语,省去不影响句子的完整性.