—Tom have you finished your homework? —Yes I before you came back mom.A. finishedB. ha

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。