问题
选择题
The image of a devoted and noble angel in white _____ heals the wounded and rescues the dying is making a comeback _____ the nation faces a crisis.
A．that…because
B．who…when
C．which…that
D．what…as
答案
答案：B
who引导的是定语从句，修饰先行词angel in white"白衣天使"；而 when引导的是时间状语从句，表示"当国家（民族）面临危机时。"