—Have you ever seen pen? I can’t find my pen anywhere.Is it blue one? It is under the

问题补充：

—Have you ever seen pen? I can’t find my pen anywhere.

--Is it blue one? It is under the book.

A. a; the

B. the; a

C. a ; a

D. the ; the

答案：

A. a; the

B. the; a

(答案→)C. a ; a

D. the ; the

解析：此题考查冠词的基本用法，a和an是不定冠词表示泛指；the定冠词表示特指。