问题描述：
I have always been honest and straightforward,and it doesn't matter _____ I'm talking to?
A who it is B it is who C who is it
为何选A,不选B,C请详细分析
蕴含什么句式?
A who it is B it is who C who is it
为何选A,不选B,C请详细分析
蕴含什么句式?
问题解答：
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