问题
选择题
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
答案：C
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。