The maker of the popular game Angry Birds announced on Tuesday that it would open its first overseas operation in Shanghai, a clear step to further enter the booming Chinese market.
A. to mark
B. marking
C. marked
D. having marked
网友回答
A. to mark
(答案→)B. marking
C. marked
D. having marked
解析：A不定式放句后，表示出人意料的结果：B 现在分词做结果状语，表示自然带来的一种结果；C marked做谓语没连词，如是分词则与主语是被动关系，语法错误；D现在分词完成时表示动作先于主句动作发出，句意：“愤怒的小鸟”的制作人在周二宣布它将在上海开始它的第一个海外合作项目，标志着明显向繁荣的中国市场迈进的一步。所以A选项正确。