Dr. Bethune worked hard as if he ____.
Dr. Bethune worked hard as if he ____.
A、never had felt tired
B、had never felt tired
C、never felt tired
D、was tired never
【正确答案】：B
【题目解析】：B as if 引导的方式状语从句中,表示对过去的情况有怀疑, 用虚拟语气，动词用过去完成时.
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