By the time I got home Gina and her sister their project already.A. finished B. have fi

问题补充：

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

A. finished

B. have finished

C. had finished

D. will finish

答案：

A. finished

B. have finished

(答案→)C. had finished

D. will finish

解析：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。