定语从句单选题He often helps the students ______ he thinks are not quick at their studies.A.whom B.who C.when D.because麻烦给点过程,谢谢
问题描述：
定语从句单选题
He often helps the students ______ he thinks are not quick at their studies.
A.whom B.who C.when D.because
麻烦给点过程,谢谢
答