问题补充：
---Do you like your maths teacher?
---Sure, because he is the teacher helps me a lot.
A. whose
B. whom
C. which
D. who
答案：
A. whose
B. whom
C. which
(答案→)D. who
解析：
试题分析: 句意：你喜欢你的数学老师吗？当然了，因为他是帮助我很多的老师。定语从句修饰the teacher，who和which指代人，故选D.
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