题目内容：

28.We finished the run in less than half the time( ) a.allowing b.to allow c.allowed d.allows
为什么不能用A.逻辑主语是哪个?The time?

优质解答

答：选C
解析：此题考查非谓语动词的用法.由于time与allow之间为被动关系,故要用过去分词.过去分词作定语,修饰名词the time,表示完成和被动,相当于定语从句that is allowed