-----Have you seen___ pen? I left it here this morning.

-----Is it __black one? I found it in the corner.

 A. a, the       B. the, the?    C. a, a       D. the, a

A


解析:

此題的最佳答案就是A，前空泛指，后空特指“談話者都知道的東西”。

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