In face of difficulties the climbers______in the hope of reaching the top before dark.
A.insisted on
B.looked up
C.turned away
D.kept on
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D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。