问题补充:
The audience when they heard the humorous story.
A. burst into laughing
B. burst out laughter
C. burst into laughter
D. burst in laughing
答案:
A. burst into laughing
B. burst out laughter
(答案→)C. burst into laughter
D. burst in laughing
解析:考查短语:突然大笑起来burst into laughter = burst out laughing,句意:当他们听到这个幽默的故事观众们突然大笑起来。所以选C。