【題目】My brother is studying in ______ university in America; he wants to be ______ astronaut in the future.

A. a; aB. a; anC. an; a D. an; an

【答案】B

【解析】此題考查冠詞的基本用法，不定冠詞有a和an兩種：a用于輔音音素開(kāi)頭的詞前，an用于元音音素開(kāi)頭的詞前。

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