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        1. My brother is studying in ______ university in America; he wants to be ______ astronaut in the future.
          A.a(chǎn); aB.a(chǎn); anC.a(chǎn)n; aD.a(chǎn)n; an
          B
          此題考查冠詞的基本用法,不定冠詞有a和an兩種:a用于輔音音素開頭的詞前,an用于元音音素開頭的詞前。
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