When the reached the top of the hill they so they had to stop for a rest.A. held their b

问题补充：

When the reached the top of the hill ,they so they had to stop for a rest.

A. held their breath

B. out of breath

C. lost their breath

D. breathed deeply

答案：

A. held their breath

B. out of breath

(答案→)C. lost their breath

D. breathed deeply

解析：考查短语辨析。held one’s breath 屏住呼吸，out of breath 气喘吁吁的，lost their breath 喘不过气来，breathed deeply 深呼吸，句意：当他到达山顶的时候，他们喘不过气来，因此他们不得不停下来休息一会。所以选C。