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(guò)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(jì)劃。故應(yīng)該用過(guò)去完成時(shí)。所以本題選C。
考點(diǎn)：本題考查時(shí)態(tài)。
點(diǎn)評(píng)：完成本題需要對(duì)過(guò)去完成時(shí)的用法熟練掌握。過(guò)去完成時(shí)表示過(guò)去時(shí)間之前發(fā)生的動(dòng)作。通俗一點(diǎn)說(shuō)就是“過(guò)去的過(guò)去”。如本題中的兩個(gè)動(dòng)作get和finish，finish就在get之前，故finish就用過(guò)去完成時(shí)。

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