题目

The pen ______he is writing is mine. A. with which      B. in which      C. on which      D. by which   答案： 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.

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