All his time _______research on Chinese history, he has no time for outdoor activities.
A．devoted to doB．devoted to doing
C．devoting to doingD．is devoted to doing
B

試題分析：考查獨(dú)立主格結(jié)構(gòu)。本句在兩個部分之間缺少連詞，說明逗號前面不是一個完整的句子，只是一個短語。All his time devoted to doing…相當(dāng)于一個原因狀語從句B Because all his time is devoted to doing…；句意：因?yàn)樗械臅r間都花在了研究中國歷史上，所以他沒有時間參加戶外活動。故B正確。
考點(diǎn)：
點(diǎn)評：當(dāng)分詞做狀語的時候，如果分詞的邏輯主語與句子主語沒有關(guān)系，就在分詞的前面直接加上邏輯主語，形成獨(dú)立主格結(jié)構(gòu)，該結(jié)構(gòu)在作用上久相當(dāng)于一個狀語從句。
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