20．We think it is difficult _________ them _________ the charity walk without team spirit．（　�。�
A．for，to finishB．of，to finishC．for，finishingD．of，finishing

分析 我認(rèn)為對(duì)他們來(lái)說(shuō)缺少團(tuán)隊(duì)精神很難完成慈善步行活動(dòng)．

解答 答案：A．
結(jié)合句意"我認(rèn)為對(duì)他們來(lái)說(shuō)缺少團(tuán)隊(duì)精神很難完成慈善步行活動(dòng)．"和本題設(shè)空處前面的it is difficult 其中形容詞是"difficult 困難的"一般用來(lái)修飾事物，句子從整體結(jié)構(gòu)來(lái)看表達(dá)的意思是"對(duì)某人來(lái)說(shuō)做某事…"，it作為形式主語(yǔ)，真正的主語(yǔ)為動(dòng)詞不定式，所以用句式：It's+adj．+for sb．+不定式，故選A

點(diǎn)評(píng) 該題考查的是介詞的區(qū)別，考點(diǎn)較細(xì)，It's+adj．+of+sb．+不定式和It's+adj．+for+sb．+不定式的區(qū)別比較抽象，應(yīng)該仔細(xì)加以區(qū)別．

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