摘要： The reason he was late for school was he had been knocked down by a bike. A. That , that B. why, why C. that, why D. why , that

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The reason he was late for school was he had been knocked down by a bike.

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The reason ________ he was late for school was ________ he had been knocked down by a bike.

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The reason ________ he was late for school was that he had been knocked down by a bike.

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The reason ________ he was late for school was that he had been knocked down by a bike.

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The reason ________ he was late for school was ________ he had been knocked down by a bike.