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

試題分析：考查時(shí)態(tài)：句意：--杰克，你已經(jīng)完成作文了嗎？--是的，我半個(gè)小時(shí)就完成了。因?yàn)闀r(shí)間是過去的半小時(shí)，所以用一般過去式，選C。
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