The mistake was（）by carelessness of the assistant. A: Adue B: Bcaused C: Cbecause D: Dowe
The mistake was（）by carelessness of the assistant. A: Adue B: Bcaused C: Cbecause D: Dowe
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The mistake was（）by carelessness of the assistant. A: Adue B: Bcaused C: Cbecause D: Dowe