She was writing a letter someone knocked at the door. A. but B. because C. when ——青夏教育精英家教网—

摘要： She was writing a letter someone knocked at the door. A. but B. because C. when D. and 答案: C

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A. but　　　　　　　　 B.because　　　　　　 C.when　　　　　　　　 D.and

She was writing a letter someone knocked at the door．

A．but B．because C．when D．and

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