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The twins, Who       their homework, were allowed to play badminton on the playground.
A.will finishB.finish
C.have finishedD.had finished
D

试题分析:句意:已经完成作业的双胞胎被允许到操场上打羽毛球。他们“被允许”用的是一般过去式,而完成作业是在被允许打羽毛球之前,属于过去的过去的动作,用过去完成时,所以选D。
【知识拓展】
过去完成时:即过去的过去所发生的事情!其构成是主语+had +过去分词。过去完成时的时间状语before, by, until , when, after, once, as soon as。表示过去某一动作之前已经完成的动作,常与由when,before等连词引导的时间状语从句连用。用于宾语从句或间接引语中,某些动词的过去完成时表示一个打算要做却没有做成的事。这类动词有:intend打算,hope希望,plan计划,mean预定,want想要, think想要,等。用于表示与过去事实相反的虚拟条件从句中
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