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：考查冠词。第一空泛指一个三明治。第二空特指20:08分的火车。句意：当我们在等待20:08分的火车时，我吃了一个三明治。故C正确。

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