问题补充:
—Tom, have you finished your homework?
—Yes, I before you came back, mom.
A. finished
B. have finished
C. had finished
D. finish
答案:
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。