I hurried to answer the telephone and it was Mabel, who had been one of my best friends we w——青夏教育精英家教网—

摘要： I hurried to answer the telephone and it was Mabel, who had been one of my best friends we were at primary school. A．while B．when C．after D．since

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I hurried to answer the telephone and it was Mabel, who had been one of my best friends ________ we were at primary school．