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问题: 怎么理解这个句子? 并划分一下句子成分! 谢谢!

We finished the run in less than half the time ____.
A. allowing B. to allow C. allowed D. allows

解答:

C
这句话是省略后的,补全的话这样讲:We finished the run in less than half the time (that was) allowed.
被允许,所以用被动。此处填过去分词。

we是主语,finished是谓语,the run是宾语,in less than half the time (that was) allowed是状语
the time (that was) allowed 又是一个定语从句
the time是先行词 that是关系代词