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
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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