【题目】I'm very grateful to my high school teachers，without _____________help I wouldn't be so excellent.
A.theirB.whom
C.whoseD.which
在线课程【答案】C
【解析】
考查介词+关系代词引导的定语从句。句意：我非常感谢我的高中老师，没有他们的帮助，我不会这么优秀。without _____________help I wouldn't be so excellent.是一个定语从句，先行词是my high school teachers，关系词在从句中作定语，故选C。