I don’t know the teacher----- is

I don't know the teacher----- is
—Do you know the boy ----s playing soccer there?
--Oh,that’s my brother.
A.what B.who C.whom D.whose
—Do you know the boy ---- is playing soccer there?
--Oh,that’s my brother.
A.what B.who C.whom D.whose

—Do you know the boy --B-- is playing soccer there?
--Oh,that’s my brother.
A.what B.who C.whom D.whose
这里的who做定语从句引导词who is playing soccer there都作定语

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