同学们在10:00完成了作业.The students ____ ____ their homework ___10:00.

问题描述:

同学们在10:00完成了作业.The students ____ ____ their homework ___10:00.

The students have finished their homework by 10;00.
可以用完成时表示动作已经完成.那相应的时间状语就不能用具体的时间点即at 10;00,而要改成by 10;00.表达的意思是一样的.