Question

—What can I do for you ?
—I want ________MP4 player for my daughter. She needs  ________

1. A.
   a, one
2. B.
   an, one
3. C.
   the, it
4. D.
   an, this

Answer 1

B
此题考查不定冠词的基本用法。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。One作为体代词，代替前文所提到的那类事物。