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A. at once B. all at once C. just this once D. once and for all[來源 :學(xué)科網(wǎng) ] 5. When they saw the police car, his attacker s turne d and ______.[來源 :學(xué)科網(wǎng) ] A. walked B. fled C. escaped D. stood 6. She smiled to me and _____ _ I realized where I had seen her. A. all at once B.