题目内容
20．There _______ nothing left in the fridge，Li Lei had to go to the supermarket to buy some food．（ ）| A． | is | B． | was | C． | were | D． | being |
分析 冰箱里什么也没剩下，李磊不得不到超市买食物．
解答 答案：D．因为前后两句中间是逗号，所以前句用独立主格，因此选择D．其他选项不是独立主格结构．
点评 考查现在分词在独立主格中的用法．
独立主格由两部分组成，前一部分是名词或者代词，后一部分是非谓语动词（不定式、现在分词、过去分词）或形容词、副词、名词或介词短语．前后两部分具有逻辑主谓关系．独立主格结构在句中作状语，多用于书面语． 独立主格结构本身不是句子，在句子中作状语，表时间、原因、条件、伴随、目的及状态等，
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