HSK V7-9
Correct

开工

/ kāigōng / 
Strokes

Definition

to begin work (of a factory or engineering operation)/to start a construction job

Example

As a Verb
(of a factory) go into operation/production
1
Gōngchǎng
工厂
kāigōng
开工
le
了
  
。

The factory has gone into operation.

2
Kāigōng
开工
bùzú
不足

operate below/under capacity

As a Verb
start up (construction, etc)
3
Zhèxiàng
这项
gōngchéng
工程
shì
是
qùnián
去年
kāigōng
开工
de
的
  
。

Work on the project began last year.

4
Xiūjiàn
修建
dàqiáo
大桥
de
的
gōngchéng
工程
yǐ
已
kāigōng
开工
  
。

The construction/building of the bridge has started.

5
Quánmiàn
全面
kāigōng
开工

be fully operative

6
Pòtǔ
破土
kāigōng
开工

break the ground for the construction (of)