—Tom, have you finished your homework?
—Yes, I before you came back, mom.
A. finished
B. have finished
C. had finished
D. finish
网友回答
A. finished
B. have finished
(答案→)C. had finished
D. finish
解析：考查时态：句意：--汤姆，你完成作业了吗？--是，你回来前我就完成了，妈妈。说明完成作业是在妈妈回来前，是过去的过去，用过去完成时，选C。