HSK V7-9
Correct

素不相识

/ sù bù xiāngshí / 
Strokes

Definition

to be total strangers (idiom)

Example

Definition

have never met before; be strangers to each other

1
Wǒ
我
yú
与
tā
他
sùbùxiāngshí
素不相识
  
。

He is a perfect stranger to me.