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By the time I got home, Gina and her sister ______ their project already.

A.finished B.have finished
C.had finishedD.will finish

C

解析试题分析:通过分析可知,吉娜和她的妹妹是在我到家之前就完成了她们的计划。故应该用过去完成时。所以本题选C。
考点:本题考查时态。
点评:完成本题需要对过去完成时的用法熟练掌握。过去完成时表示过去时间之前发生的动作。通俗一点说就是“过去的过去”。如本题中的两个动作get和finish,finish就在get之前,故finish就用过去完成时。

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