I atesandwich while I was waiting for20:08 train. (2008陕西卷)A. the, aB. the, theC. a, theD.

I ate sandwich while I was waiting for 20:08 train. (2008陕西卷)
A. the, a
B. the, the
C. a, the
D. a, a

A. the, aB. the, the(答案→)C. a, theD. a, a解析：考查冠词，a/an表示泛指；the表示特指，吃了一个三明治，所以用冠词a，20:08 train表示特指的那辆火车，所以用定冠词the，句子意思“当我等20:08火车的时候我吃了一个三明治”，所以选C

谢谢了