问题标题:
【定于从句问题①Hehasthreesons,noneof__A___isadoctor.②Hehasthreesons,butnoneof___B_isadoctor.③He】
问题描述:

定于从句问题

①Hehasthreesons,noneof__A___isadoctor.②Hehasthreesons,butnoneof___B_isadoctor.③Hehasthreesons,____D___aredoctors.

④Hehasthreesons;_C___are

doctors.

A.whomB.themC.theyD.who

告诉我为什么这样填?

宋汐瑾回答:
  介词+whom,them,他们是宾格形式   they,是主格,充当主语
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