【題目】The maths problem was so difficult that none of us could ____.

A. try it out B. work it out C. look it up D. work on it

【答案】B

【解析】本題主要考查動(dòng)詞短語辨析,句意是這道數(shù)學(xué)題太難沒人做得出來,look up查找;;work on從事;根據(jù)題意故選B

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