Question

________ old man behind Mary is ________ university teacher

1. A.
   An, an
2. B.
   A, the
3. C.
   The, a
4. D.
   The, an

Answer 1

C
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。