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

試題分析：句意：已經(jīng)完成作業(yè)的雙胞胎被允許到操場上打羽毛球。他們“被允許”用的是一般過去式，而完成作業(yè)是在被允許打羽毛球之前，屬于過去的過去的動作，用過去完成時，所以選D。
【知識拓展】
過去完成時：即過去的過去所發(fā)生的事情！其構(gòu)成是主語+had +過去分詞。過去完成時的時間狀語before, by, until , when, after, once, as soon as。表示過去某一動作之前已經(jīng)完成的動作，常與由when，before等連詞引導(dǎo)的時間狀語從句連用。用于賓語從句或間接引語中，某些動詞的過去完成時表示一個打算要做卻沒有做成的事。這類動詞有：intend打算，hope希望，plan計(jì)劃，mean預(yù)定，want想要， think想要，等。用于表示與過去事實(shí)相反的虛擬條件從句中
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