题目内容
13．______，his mother has to take care of him at home．（ ）| A． | Being ill | B． | He being ill | C． | He is ill | D． | His to be ill |
分析 他病了，他母亲不得不在家照顾他．
解答 答案：B
题干中没有连词，中间有逗号分隔，可以知道前面不能是句子；句子表达的是他生病了，不是他母亲，A项分词错误；独立主格结构是由名词（代词）+现在分词（过去分词；形容词；副词；不定式；名词；介词短语等）构成．故选B．
点评 独立主格结构是由名词或代词加上分词等构成的一种独立结构，用于修饰整个句子．独立主格结构中的名词或代词与其后的分词等构成逻辑上的主谓关系．这种结构与主句不发生句法上的联系，它的位置相当灵活，可置于主句前、主句末或主句中，常由逗号将其与主句分开．需特别注意的是，独立主格结构与主句之间不能使用任何连接词．
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