题目内容：

hand in you papers when you__(finish)the test

优质解答

have finished
答完就交卷!

追问：

为甚不用将来完成时

追答：

一是理解成条件句： (You) hand in you papers when you have finished the test . 就是说： if you have finished the test ,then hand in.... 另一种想法。 (You) hand in you papers when you have finished the test . 主从句其实动作很近， 要保持一致的时态。