--- Why did you laugh just now?
--- John wanted to tell us very funny joke, but he forgot end himself.
A. /; the
B. a; an
C. a; the
D. the; the
网友回答
A. /; the
B. a; an
(答案→)C. a; the
D. the; the
解析：句意：刚才你为什么笑？——约翰想给我们讲一个非常有趣的笑话，但是他自己忘了结尾。结合语境可知下文前一空泛指任何一个有趣的故事，故用不定冠词。下文特指前文故事的结尾，故用定冠词，选C。