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______, his mother has to take care of him at home.
A.Being illB.He being illC.He is illD.His to be ill
B

试题分析:考查独立主格结构。独立主格结构不是句子,是一个短语,但是作用相当于句子。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。本句在两个部分之间没有连词,说明前面一部分是独立主格结构,He being ill="Because" he is ill.句意:因为他病了,他的妈妈不得不在家照顾他。故B正确。
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。
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