― Have you finished your composition already, Jack?
― Yes. I _____ it within half an hour.
A．have finishedB．finishC．finishedD．will finish
C

試題分析：句意：―杰克，你寫完你的作文了嗎？― 是的，我半個小時就完成了。C. finished為一般過去時，一般過去時也可以表示過去一段時間內(nèi)發(fā)生的動作。A. have finished是現(xiàn)在完成時;B. finish是一般現(xiàn)在時; D. will finish 是一般將來時的謂語動詞形式。
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