With his attention _________ on his book, he didn’t notice someone entering his room.
A．concentratingB．concentratedC．to concentrateD．concentrates
B

試題分析：考查非謂語動(dòng)詞。with+名詞+doing/done構(gòu)成復(fù)合結(jié)構(gòu)，attention與concentrate是動(dòng)賓關(guān)系，即“集中注意力”，應(yīng)該用過去分詞，排除A；with后不能用動(dòng)詞原形或三單，排除D；句意：由于注意力在他的書上，他沒有注意到有人進(jìn)入他的房間。根據(jù)句意可知，是已經(jīng)發(fā)生的事情，動(dòng)詞不定式表將來，排除C。故選B。
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