题目内容：

the pen____he is writing is mine. A. with which B.by which 请写出详细解答过程,为什么不选B.
没有write by the pen 这种用法么？

优质解答

在这道题中,是考察带介词的定语从句,the pen是在从句中做宾语,若放在句中,正常语序应为he is writing with the pen,is writing by the pen.该从句中不含有被动,所以不用by