Simon was why many of his friends didn’t turn up at his birthday party.
A. limited
B. crashed
C. spotted
D. puzzled
网友回答
A. limited
B. crashed
C. spotted
(答案→)D. puzzled
解析：考查动词：A. limited限制B. crashed冲撞C. spotted 看见 D. puzzled使…迷惑，这里的过去分词相当于形容词：感到困惑的，句意：Simon感到困惑，为什么很多朋友没有参加他的生日聚会。选D。