A new study found a teacher has anxiety about math feeling can influence how his or her

问题补充：

A new study found a teacher has anxiety about math, feeling can influence how his or her female students feel about math.

A. when that; which

B. that when; that

C. that if; which

D. if that; that

答案：

A. when that; which

(答案→)B. that when; that

C. that if; which

D. if that; that

解析：句意：一份新的研究发现当一个老师对数学感到棘手时，那种感觉也能影响到他的女学生对数学的感觉。found后接宾语从句，宾语从句中又有when所引导的时间状语从句，故选B