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My brother is studying in ______ university in America; he wants to be ______ astronaut in the future.
A.a; aB.a; anC.an; aD.an; an
B
此题考查冠词的基本用法,不定冠词有a和an两种:a用于辅音音素开头的词前,an用于元音音素开头的词前。
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