In face of difficulties the climbers in the hope of reaching the top before dark.A. insis

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A. insisted on
B. looked up
C. turned away
(答案→)D. kept on
解析：keep on可用作及物动词和不及物动词，意思为 “继续”。句意：尽管困难重重，登山队员们继续前进，希望天黑前到达山顶。insist on为及物动词，意思为“坚持”；look up“查寻向上看；仰视”；turn away“转过脸去；转换方向”。