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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

解析試題分析：通過分析可知，吉娜和她的妹妹是在我到家之前就完成了她們的計劃。故應(yīng)該用過去完成時。所以本題選C。
考點：本題考查時態(tài)。
點評：完成本題需要對過去完成時的用法熟練掌握。過去完成時表示過去時間之前發(fā)生的動作。通俗一點說就是“過去的過去”。如本題中的兩個動作get和finish，finish就在get之前，故finish就用過去完成時。

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