The image of a devoted and noble angel in white _____ heals the wounded and rescues the dying is making a eback _____ the nation faces a crisis.A.that…becauseB.who…whenC.which…thatD.what…as
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B解析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。