The reason ____ he was late for school was _____he had to send his mother to a hospital.
A．that; whyB．why; becauseC．why; thatD．that; because
C

試題分析：句意：他為什么會上學(xué)遲到的原因是他不得不送媽媽去醫(yī)院。第一空填why。引導(dǎo)定語從句，先行詞是reason，定語從句中缺少原因狀語，第二空填that，連接表語從句，當(dāng)主語是the reason的時候，表語從句用that連接，所以選C。
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