I ate sandwich while I was waiting for 20:08 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：我吃了一个三明治，一般所指；特指哪一列火车，用定冠词the.

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