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：考查獨立主格結構。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…相當于一個原因狀語從句B Because all his time is devoted to doing…；句意：因為他所有的時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：
點評：當分詞做狀語的時候，如果分詞的邏輯主語與句子主語沒有關系，就在分詞的前面直接加上邏輯主語，形成獨立主格結構，該結構在作用上久相當于一個狀語從句。
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