Question

________ that far, the whole class didn't want to turn back, because they were afraid to walk in the dark．

1. A.
   Going
2. B.
   Having gone
3. C.
   To go
4. D.
   Gone

Answer 1

B
这句句子的意思是“已经走了那么远，整个班级不想再回头，因为他们害怕走夜路。”这里的didn't want是句子的主要谓语，而going和the whole class构成主动关系，而“已经走那么远”，说明有很明显的先后关系，所以我们用Having done作状语。