问题补充：
15. A group of children around the old man, listening to him telling the story and they when it came to something really exciting.
A. were gathered; held their breaths
B. gathered; held their breath
C. gathered; held their breaths
D. were gathered; held their breath
答案：
A. were gathered; held their breaths
(答案→)B. gathered; held their breath
C. gathered; held their breaths
D. were gathered; held their breath
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