他 没 来 的 原 因 是 他 车 祸 重 伤 。
他 之 所 以 没 来 是 他 在 车 祸 中 受 了 重 伤 。
The reason why he didn't come was: 他 没 来 的 原 因 是
he was seriously injured in a car accident: 他 在 车 祸 中 受 了 重 伤
The reason (why he didn't come) was that--- That was the reason. 那 就 是 原 因 。 原 因 就 是 那 个 。
That was the reason why he didn't come: he was seriously injured in a car accident.
The reason___why_____he didn't come was ___that__he was seriously injured in a car accident.
the reason why 固定搭配“...的原因”
后一空that，宾语从句的引导词
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