Answer: A
Analysis:
The most common structure to use with this phrase is: Someone + 一口气 + verb (+ 了 + Obj.)
Therefore, the correct location to insert the phrase “一口气” is in spot number 1.
Tā yìkǒuqì chuī miè le làzhú.
他 一口气 吹 灭 了 蜡烛。
He blew out the candles with a single puff.
<<Back to “Run 100m in Under 10 Seconds? No problem! Learn “一口气 (yìkǒuqì)””