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

题目：

—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

【答案解析】显示答案解析

这里显示答案和解析