Do you know her to that girl?She is her sister在空白处填入单词Do you know her ________to that girl?She is her sister

问题描述:

Do you know her to that girl?She is her sister
在空白处填入单词
Do you know her ________to that girl?She is her sister

哪有空白处?
打横线好了

her 后面的空?
应该填relationship.