—How do you know that he has bought MP5?
--- He wrote e-mail to me yesterday.
A. a, an
B. an, an
C. a, the
D. the, a
网友回答
A. a, an
(答案→)B. an, an
C. a, the
D. the, a
解析：句意:你怎么知道的他买了一部MP5?——昨天他发了一个电子邮件给我。结合语境可知前后两空都是泛指任何一个，MP5和e-mail的词首音素都是元音，故不定冠词用an，选B。