old man behind Mary is university teacher.A. An, anB. A, theC. The, aD. The, an

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A. An, an
B. A, the
(答案→)C. The, a
D. The, 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the表示特指。