We finished the run in less than half the time( )

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We finished the run in less than half the time( )
a.allowing b.to allow c.allowed d.allows 这道题选C,请问过去分词做定语时,是相当于一个形容词还是表达已经完成的事情?还有,这道题为什么不能选B?是不是要用被动,如果把b改为to br allowed ,那么可以吗?

过去分词做定语表示被动.是一个形容词,表示“被容许的”的时间
再问：把b改为to be allowed 那么可以吗
再答：不可以哦。to be allowed 含有将来时的意思，但本句话中没有将来的意思，时间是在赛跑之前就已经确定了的。
再问：那改为to have allowed呢？
再答：也不可以哦。没有被动的意思了。to have been allowed 也不行，可以改为that was allowed,做一个time 的同位语从句。
再问：请问，为什么to have been allowed 也不行呢？
再答： to have been allowed 实际上是一个目的状语从句了，很显然time在此处并不需要目的状语从句来修饰，由前半句话就可以判断出time的目的就是run。

28.We finished the run in less than half the time( ) a.allow 1.We finished the run in less than half the time ____. We finished the work in less than half the time allow如何改错 We finished the run less than the time （　　） A allowed B allo We finished the run in less than the time__ A.allowing B.to 英语翻译For the first time in modern history,less than half of t 一道完成句子的题目The newcomer finished the program in less than ( ) The test was so easy that I finished it in half the time ___ Still,that is less than half the levels in two thoudsand thr In the past,we went back to the original less than in the pa ANSYS提示present time is less than the previous time in a tran 是in the half-time 还是on the half-time还是at the half-time