I’m very grateful to my high school teachers, without help I wouldn’t be so excellent.
A. whom
B. their
C. which
D. whose
网友回答
A. whom
B. their
C. which
(答案→)D. whose
解析：由逗号可知，这是一个主从复合句的结构，因此可排除B，由后面的help缺少定语可知，应用whose 作定语.而whom which 没有定语的功能，故答案为D
句意为：我非常感谢我的高中老师，没有他们的帮助我不会如此的优秀。