摘要： To make sure that he was at home, I called him up . A. at ease B. in general C. by chance D. in advance [解析]选D .考查介词词组辨析.句意为:为了确保他在家.我提前给他打了电话.at ease舒适地, in general总的来说, by chance偶然地, in advance提前.符合句意.

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