问题补充:
----- Mr Green is teacher. He is English teacher.
A. a; a
B. a; an
C. an; a
D. an; an
答案:
A. a; a
(答案→)B. a; an
C. an; a
D. an; an
解析:英语不定冠词的用法主要是看后接单词的词首音素是否为元音,元音前用an,辅音前用a。Teacher词首音素为辅音,English词首音素为辅音,故选B。
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