Correct

打问号

/ dá wènhào / 
Strokes

Example

As a Verb

put a question mark—raise a question about; express doubts about

1
Wǒmen
我们
duì
对
duìfāng
对方
de
的
chéngyì
诚意
dá
打
le
了
gè
个
wènhào
问号
  
。

We had doubts about the sincerity of the other party.

2
Tā
他
de
的
qiántú
前途
hái
还
de
得
dá
打
shàng
上
yī
一
gè
个
dàdà
大大
de
的
wènhào
问号
  
。

A big question mark hangs over his future. / Over his future stands a gigantic question mark.