问题
选择题
The dog had _____ serious toothache so its owner took it to _____ animal doctor.
A．an, an
B．the, /
C．a, /
D．a, an
答案
答案：D
题目分析：句意：这只狗得了严重的牙疼病所以它的主人把它带去看医生。不定冠词表示某一类人或某事物中的任何一个,经常用在第一次提到某人或某物时,用不定冠词起介绍作用，表示一个。have a …,生……病。故选D