never fail to V 문장 질문 있어요

“They had light the lanterns when a bell rang in the evening. If they failed to do so, they were fined heavily.”가 문제에서 “If they never (succeeded / failed) to do so, they were fined heavily.”로 바뀌었어요.
succeeded와 failed 중 succeeded가 답이라는데, 왜 그런지 설명 부탁드려요.

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