Question

-----Have you seen___ pen? I left it here this morning.
-----Is it __black one? I found it in the corner

1. A.
   a, the
2. B.
   the, the
3. C.
   a, a
4. D.
   the, a

Answer 1

A
此题的最佳答案就是A，前空泛指，后空特指“谈话者都知道的东西”。