I guess we’ve already talked about this before but I’ll ask you again just .A.by natureB
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：本题考查介词短语。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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