He got high marks .It was all ___he had worked hard.填什么?为什么这么填?

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He got high marks .It was all ___he had worked hard.填什么?为什么这么填?
He got high marks .It was all ___he had worked hard.填什么?
为什么这么填?

He got high marks .It was all ___he had worked hard.填什么?为什么这么填?
because,这是原因的意思.it was all because 全是因为.