题目内容：

mrs liu worked as ________english teacher for more than 10 years
A (/) B(a) C(an) D(the)

优质解答

参考答案：C(an)解析：an的用法,是不定冠词,放在单数可数名词前面,并且该名词是以元音音素开头的,表示一类人或事物,此时用an,如an egg/ ant/ apple.
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