Question

Portia，for ________ physics had once been very hard，turned out to be a physicist.

A．whom

B．whose

C．that

D．which

Answer 1

for whom(对她来说)引导一个非限定性定语从句，补充说明主语Portia。在介词后面只能用which或whom，不能用that。题干中如果没有for，则应该选whose。