― Have you finished your position already, Jack?
― Yes. I it within half an hour.
A. have finished
B. finish
C. finished
D. will finish
网友回答
A. have finished
B. finish
(答案→)C. finished
D. will finish
解析：句意：―杰克，你写完你的作文了吗？― 是的，我半个小时就完成了。C. finished为一般过去时，一般过去时也可以表示过去一段时间内发生的动作。A. have finished是现在完成时;B. finish是一般现在时; D. will finish 是一般将来时的谓语动词形式。