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In face of difficulties the climbers______in the hope of reaching the top before dark.
A．insisted onB．looked upC．turned awayD．kept on
D
keep on可用作及物動(dòng)詞和不及物動(dòng)詞, 意思為 “繼續(xù)”。句意：盡管困難重重，登山隊(duì)員們繼續(xù)前進(jìn)，希望天黑前到達(dá)山頂。insist on為及物動(dòng)詞，意思為“堅(jiān)持”；look up查尋，向上看；仰視；turn away轉(zhuǎn)過臉去；轉(zhuǎn)換方向。
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