问题补充：
“Luck is matter of preparation meeting opportunity,” said Oprah Winfrey, American Talk show host.
A. a; an
B. the; an
C. a; /
D. the; /
答案：
(答案→)A. a; an
B. the; an
C. a; /
D. the; /
解析：a matter of “。。。的事情”It is a matter of time.
美国脱口秀的主持人，泛指。用an.
