I lost key to the door yesterday. It was unlucky day for me.A. the; aB. the; anC. a; aD. a

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A. the; a
(答案→)B. the; an
C. a; a
D. a; an
解析：此题重点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。定冠词指双方都知道的人或事物。特指某（些）人或某（些）事物。