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
答案: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 。