I atesandwich while I was waiting for20:08 train.A. the, aB. the, theC. a, theD. a, a

I ate sandwich while I was waiting for 20:08 train.
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：在等20:08的火车期间吃了一个三明治，是泛指，八点零八分的火车当然是特指的了。故选C。

和我的回答一样，看来我也对了