Correct

从打

/ cóng dá / 
Strokes

Example

As a Preposition

since

1
Cóng
从
dá
打
tā
他
lái
来
hòu
后
  
,
bàngōngshì
办公室
jiù
就
biàn
变
de
得
gānjìng
干净
le
了
  
。

The office has become cleaner since he came.