She was so amused with the magician’s tricks that she a smile.
A. broke out
B. burst into
C. burst out
D. got into
网友回答
A. broke out
(答案→)B. burst into
C. burst out
D. got into
解析：考查短语辨析。A爆发；B突然…起来（后面接名词）；C突然…起来（后面接doing）;D进入；句意：她对于魔术师的小把戏如此惊讶以至于她突然笑了起来。根据句意说明B正确。