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：考查定语从句：句意：--你喜欢你的数学老师吗？--当然了，因为他是给我很多帮助的老师。先行词是the teacher，定语从句缺少主语，用who引导定语从句，选D。
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