摘要:7.I guess we’ve already talked about this before but I’ll ask you again just . A.by nature B.in return C.in case D.by chance [解析]:C.考查介词短语.分析四个选项的意思:by nature 天生地,in return作为回报.作为交换,in case 万一.以防,by chance偶然地.根据句意:我想我之前已经跟你谈论过这件事.但是以防万一.我再问你一次.

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