题目内容：

The pen ______he is writing is mine.A.with which B.in which C.on which D.by which 【解析】

优质解答

The pen ______he is writing is mine. A. with which B. in which C. on which D. by which 【答案】 A 【解析】write with a pen用笔写 表伴随状态（固定搭配）