Correct

一至于此

/ yī zhìyú cǐ / 
Strokes

Example

Definition

should have come to such an extent

1
Bù
不
xiǎng
想
xiānsheng
先生
yī
一
bìng
病
yīzhìyú
一至于
cǐ
此
  
!

I never expected that you would be so seriously ill!