---Have you seen pen? I left it here this morning.
---Is it black one? I think I saw it somewhere.
A. a; the
B. the; the
C. the; a
D. a; a
网友回答
A. a; the
B. the; the
C. the; a
(答案→)D. a; a
解析：本题虽说是考查冠词的用法，但也是语义+思维定式考查的具体体现。问句与答语中的Pen 均非特指，对象不明确，故前后用不定冠词。