Question

All his time _______research on Chinese history, he has no time for outdoor activities.

A．devoted to do

B．devoted to doing

C．devoting to doing

D．is devoted to doing

Answer 1

B

试题分析：考查独立主格结构。本句在两个部分之间缺少连词，说明逗号前面不是一个完整的句子，只是一个短语。All his time devoted to doing…相当于一个原因状语从句B Because all his time is devoted to doing…；句意：因为他所有的时间都花在了研究中国历史上，所以他没有时间参加户外活动。故B正确。
考点：
点评：当分词做状语的时候，如果分词的逻辑主语与句子主语没有关系，就在分词的前面直接加上逻辑主语，形成独立主格结构，该结构在作用上久相当于一个状语从句。