Correct

一唱一和

/ yī chàng yī hé / 
Strokes

Definition

to echo one another (idiom)

Example

Definition

sing a duet with sb; sing the same tune; echo each other

1
Nā
那
liǎng
两
gè
个
guójiā
国家
zài
在
zhōngdōng
中东
wèntí
问题
shàng
上
zǒngshì
总是
yīchàngyīhé
一唱一和
  
。

Those two countries have always sung the same tune on the Middle East issue.