题目: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
喵查答案:C
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。