He is a strict but kind-hearted father the children respect but are afraid of.A. /B. th

问题补充：

He is a strict but kind-hearted father, the children respect but are afraid of.

A. /

B. that

C. for whom

D. one whom

答案：

A. /

B. that

C. for whom

(答案→)D. one whom

解析：替代词one在句中作同位语，代指father，后面再接一个定语从句。先行词one又在从句中充当宾语。