问题补充：
after a long walk, Mike called and said he couldn’t come to the party.
A. Having worn out
B. Being worn out
C. To wear out
D. Worn out
答案：
A. Having worn out
B. Being worn out
C. To wear out
(答案→)D. Worn out
解析：考查非谓语动词，句意为：长距离步行之后十分疲劳，迈克打电话说他不能来参加聚会了。Be worn out是精疲力竭的意思，这里用过去分词表示状态，在此句中表原因，Having worn out没有表达出be worn out这个词组，Being worn out表示和谓语动作同时发生的被动动作；To wear out不定式表示目的； D为正确答案。
