The pen ______he is writing is mine.
A. with which B. in which C. on which D. by which
The pen ______he is writing is mine.
A. with which B. in which C. on which D. by which
A
with which是"介词+关系代词"结构,常用来引导定语从句.with有"用"的意思,介词之后只能用which,不能用that. with which在定语从句中作状语,即he is writing with a pen.